1500 alternator


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hap2
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1500 alternator

Postby hap2 » Sun Jul 27, 2014 6:30 pm



With my multimeter on the battery of my 1992 GoldWing 1500SE, and on the 20 V setting of the meter, without the bike even running, it showed 11.97 V & apparently it should show more than 12.4.

With the bike running, at 2500 RPM for 30 secs, it shows 13.62 on the meter.

A couple of questions:
Knowing this, am I save to go on a 75 mile ride, turn it off for 2 hrs, & ride it back again?

Also, I was gonna take my little trailer. Do u think I can plug in the lights of the trailer or not?

One more question: Am Isafe to keep riding it around town as long as I keep the rpms over 2000?

Thank you very much.



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Re: 1500 alternator

Postby bustedwing » Sun Jul 27, 2014 7:24 pm

So far you know your charging system is working, and your battery is marginal. To make the trip will depend upon the load you put on your changing system during the trip. Any time you are above idle the charging system can handle the bike systems without any problem. Usually what is on the trailer is very little, unless you have something that drains power from the battery especially when the engine is turned off. Keep in mind that sooner or later the battery will have to be replaced. It will get to the point where it will not take a charge and your bike needs at least 10 volts or the coils will not fire. If it decides to do that when you are 200 miles from home on Sunday, then I hope you have good traveling insurance. Ride safe
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Re: 1500 alternator

Postby hap2 » Sun Jul 27, 2014 7:36 pm

Thanx Bustedwing, but the guy at the battery place determined there is nothing wrong with he battery. He said it's the alternator. I tend to believe that the alternator is the reason the battery's weak.

That's y I'm gonna look at getting the alternator replaced

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Re: 1500 alternator

Postby ct1500 » Sun Jul 27, 2014 9:23 pm

13.6V ain't all that great, what is the idle voltage with fans off and with non OEM electrical devices turned off?
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Re: 1500 alternator

Postby hap2 » Sun Jul 27, 2014 10:56 pm

I failed to check idle voltage, but will tomorrow & letcha know. I'll make sure there's no non-oem stuff on. Can't help all the lights being on tho. I got the cornering lights on all the time, also, there's the little amber "side-stand" light that comes (even tho the side stand is up).

I'd like to know how to fix that side-stand thing tho. I wouldn't mind having that safety switch active again so that bike won't start if the kick stand is down. I had a bungy cord going even when the kickstand was up from the kick stand spring to the right brake (from the underneath) holding down sheep skin seat cover & something happened one day & that amber light wudn't shut off

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Re: 1500 alternator

Postby MikeB » Sun Jul 27, 2014 11:53 pm

If the battery shows 11.97 when everything is off, the battery voltage is low. How that voltage got low is what you need to investigate. Did it get low because there is a larger than normal current drain while the ignition is off or did it get low because one or more of the cells in the battery are failing. A good battery should show 12.6 volts to 12.8 volts.
With the engine running, using an OEM alternator and RPM above 1500, the voltage on the terminals of a known good battery should be about 13.8 volts.
With a low battery, it makes sense that the voltage at the battery with the engine above 1500 RPM is showing low voltage. The alternator is working its little armature off trying to charge the battery AND supply sufficient current to all the operating electrics on the motorcycle. The alternator should not have to expend extra energy trying to charge a weak battery.
If you continue to use a battery that is low, you can damage the alternator and or regulator (which is in the alternator). I have always been told that the charging system is a triad; battery, alternator, regulator. If any one of the three is not holding up its end of the bargain, one or both of the other two can and usually does fail.
Installing a different alternator is not going to fix your weak battery.
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Re: 1500 alternator

Postby hap2 » Mon Jul 28, 2014 8:10 am

In all fairness, I had no reason to check anything before the following happened:

I didn't turn the key all the way off one evening & the bike was completely dead after letting it sit for 12 hrs (overnight). I gave it a boost with my car. Once it got running, I took the booster cables off. 2 min later, the bike died. I did that twice. The third time, I was able to get one it real quick before it stalled & take it for a 20 min run on the highway at between 4000 & 5000 rpm. I brought it home, let it sit 5 min & it started. I did a load test. It showed weak under a 10 sec load test. I took the bike (running) to the battery shop & they said it was the alternator. The alternator was only putting out 13.62 @1500 RPM.

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Re: 1500 alternator

Postby cbx4evr » Mon Jul 28, 2014 10:08 am

Was the car running when you boosted the Goldwing battery?
"It´s a friggen motorcycle, it´s not supposed to be comfortable, quiet or safe. The wind noise is supposed to hurt your ears, the seat should be hard and riding it should make you s**t your pants every now and then. "

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Re: 1500 alternator

Postby hap2 » Mon Jul 28, 2014 10:12 am

Yes, the car was running when I boosted the bike

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Re: 1500 alternator

Postby cbx4evr » Mon Jul 28, 2014 10:39 am

Not a recommended practice. I'm sure the electrical Guru's will jump in and tell you why. You likely killed something, either the battery or the alternator.
"It´s a friggen motorcycle, it´s not supposed to be comfortable, quiet or safe. The wind noise is supposed to hurt your ears, the seat should be hard and riding it should make you s**t your pants every now and then. "

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Re: 1500 alternator

Postby hap2 » Mon Jul 28, 2014 10:53 am

Seemed to accomplish the purpose as it DID start & it bike did start on its own after sitting overnight.

Twas just super dead & needed a good run...probly longer than the 20 min highway drive I gave it.

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Re: 1500 alternator

Postby MikeB » Mon Jul 28, 2014 11:32 am

hap2 wrote:In all fairness, I had no reason to check anything before the following happened:

I didn't turn the key all the way off one evening & the bike was completely dead after letting it sit for 12 hrs (overnight). I gave it a boost with my car. Once it got running, I took the booster cables off. 2 min later, the bike died. I did that twice. The third time, I was able to get one it real quick before it stalled & take it for a 20 min run on the highway at between 4000 & 5000 rpm. I brought it home, let it sit 5 min & it started. I did a load test. It showed weak under a 10 sec load test. I took the bike (running) to the battery shop & they said it was the alternator. The alternator was only putting out 13.62 @1500 RPM.


Now that we know the full story, it is making better sense.

The alternator is an excellent source of energy for the motorcycle. It provides an ample supply of current to supplement the current available from the fully charged battery. And, it will maintain the charge level of the battery while you ride. But, in all fairness to the abilities of the alternator, it was not designed to be a battery charger.

Yes, it tops up the battery after starting and will supplement the battery in supplying power to the motorcycle while you ride. But, it's purpose is supplement the battery's output, not charge a dead or severely discharged battery. It took many hours to drain the battery. In turn, it will take several hours to bring it back up to full charger.

With the battery disconnected from the motorcycle, connect a charger to the battery for a few hours and let it come back to full charge. Remove the charger and let the battery set for another few hours and then do a load test of the battery. If the battery is still good, it will load test acceptably and you can reconnect it to the motorcycle.

Overworking the alternator and regulator by trying to charge a near dead battery is never a good idea.
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Re: 1500 alternator

Postby hap2 » Mon Jul 28, 2014 11:43 am

OK..I hope that doesn't happen again, but if it does ('touch wood" [whatever that's sposed to mean] it won't) happen again, I just put the 2 AMP trickle charger on it for a few (or more) hours until it starts.

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Re: 1500 alternator

Postby hap2 » Mon Jul 28, 2014 2:06 pm

FYI:
The bike was sitting all night (close to 12 hrs). I put the meter on the battery w/o even starting it up & it read 12.04 V.

Then I started it up & just let it idle (about 400 rpm) It read 11.83 just idling.

I then revved it to 1500 for about 20 secs & it read 13.65

Whatever all that means maybe u can tell me.

Thank you!

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Re: 1500 alternator

Postby MikeB » Mon Jul 28, 2014 2:26 pm

hap2 wrote:FYI:
The bike was sitting all night (close to 12 hrs). I put the meter on the battery w/o even starting it up & it read 12.04 V.

Then I started it up & just let it idle (about 400 rpm) It read 11.83 just idling.

I then revved it to 1500 for about 20 secs & it read 13.65

Whatever all that means maybe u can tell me.

Thank you!

It tells me that the you have a stock alternator and it is working. But is also tells me that the battery charger is low. Sitting over night on the motorcycle, a healthy battery should still read about 12.75 volts.
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Re: 1500 alternator

Postby hap2 » Mon Jul 28, 2014 3:15 pm

Thanks Mike. So what do u suggest I do? I have a 2 amp charger. I can also go back to the battery place but not sure what to tell them. Just 2 days ago, they checked everything & told me there was nothing wrong with the battery.

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Re: 1500 alternator

Postby MikeB » Mon Jul 28, 2014 3:53 pm

hap2 wrote:Thanks Mike. So what do u suggest I do? I have a 2 amp charger. I can also go back to the battery place but not sure what to tell them. Just 2 days ago, they checked everything & told me there was nothing wrong with the battery.

The battery is probably okay. It just needs to be charged and brought bake to life. Charge it and test it again.
Or, take it back to where you bought it and have them put it on their charger overnight. Then have them test it. I assume the battery place you took it to is where you bought it.
I'd suggest a float charger like a Schumacher XM1-5 Maintainer over a constant current 2A charger. I don't know which charger you have but most chargers now are float chargers.
The Schumacher XM1-5 Maintainer is sold at WalMart and they are only about $19. I have two of them and they work quite well.
If the battery doesn't come back up to proper voltage, I'd suggest getting a new one if you continue you experience low battery capacity.
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Re: 1500 alternator

Postby ct1500 » Mon Jul 28, 2014 7:27 pm

What is the voltage at normal specified idle of 800RPM at operating temp and with fans and brake lights off?

No one does a voltage check at 400?RPM as it WILL NOT be charging and is meaningless.
Last edited by ct1500 on Mon Jul 28, 2014 7:50 pm, edited 2 times in total.
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Re: 1500 alternator

Postby ct1500 » Mon Jul 28, 2014 7:43 pm

hap2 wrote:FYI:
The bike was sitting all night (close to 12 hrs). I put the meter on the battery w/o even starting it up & it read 12.04 V.


Is this with the key on or off? When checking a static battery voltage it is with key off. I have to believe this is with the key on. If after charging your static voltage was that low there is no way whoever tested the battery did not sell you a new one. I am leaning towards the guy at the alternator shop is correct and the battery is good.

Is this an AGM battery by chance? When a very discharged battery has a boost start without a proper slow charge it can blow the alternator with the current surge going into the battery. Ask any Harley guy or myself for that matter as I have seen it happen on a 1500 with AGM. :D
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Re: 1500 alternator

Postby Ed Z » Sun Aug 03, 2014 5:13 am

Jump starting with a car battery (car running or not) supplies a huge amount of current to drained cells in a very quick manor... This (if left on for any measure of time) can and will warp plates in the small bike battery... Even if you have a weak battery the bikes charging system dumps a whole lotta amps to the battery till it's back up to charge... All of these things are rough on a battery... Question: was the battery fully charged when the "battery guy" tested it ??? If not then the test is invalid...

As for the alternator, I have found that most often a good cleaning and brush replacement results in a good alternator for the next 100,000 miles... There were a couple years Honda out sourced the alternator (96 to 98 comes to mind) and there were issues with the slip rings on these… Ya might consider getting new drive cushions as they do tend to age and get hard with age... In any case, ya should be able to have the alternator tested just about anywhere to verify it is OK...

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Re: 1500 alternator

Postby hap2 » Sun Aug 03, 2014 8:56 am

Ed Z: That's super info u just gave me I didn't know b4.

Bike starts & runs perfect now, so I guess IF I caused any damage boosting it with the car, any damage was nominal.

Thank you very much.

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Re: 1500 alternator

Postby Ed Z » Sun Aug 03, 2014 12:32 pm

Cool, and your most welcome...




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