three yellow wires


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three yellow wires

Postby woodward » Sun Mar 06, 2011 10:18 pm



To check the charging system on a 86 Aspecade the manuals flow chart states that if the voltage of each yellow wire are close then replace the regulator. There are no specs listed. There is a table for a ampmeter test with 0-6 as the paramaters for 3000 rpm's and 0-6 for 5000 rpm's. How can 0 amps be good? Do any of the techs out there know a better way?


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Re: three yellow wires

Postby WingAdmin » Mon Mar 07, 2011 12:07 am

It's because the voltage will vary depending on the engine RPM, temperature, phase of the moon, etc. The likelihood of all three legs failing identically at the same time is remote. Hold the RPM steady, and measure the voltage on each of the three legs. If it's close on each of the three legs, you're OK. (At 2000-2500 RPM you will see roughly 48 VAC, but it varies as mentioned).

With the bike off, you can measure for leakage (use ohmmeter to measure each lead to ground - should be infinite resistance) and coil failure - each lead to each other lead should be around 2 ohms or so (that number is from memory, but it should be close).
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Re: three yellow wires

Postby thrasherg » Mon Mar 07, 2011 11:22 am

I would suggest running both of admin's tests. Use a multimeter to check the resistance between all the wires (looking for a couple of ohms) and then check that there is no connection to earth (Negative lead of battery). This will confirm that no coils have burnt out. Then start the engine with the 3 pin plug disconnected and check across all 3 wires (if wires are numbered 1, 2 & 3, then check you have AC voltage from pins 1 to 2, 1 to 3 and 2 to 3) with a multimeter. If you do then the alternator is working (as mentioned the voltage will be quite high >40 volts as the alternator is under no load). Whilst you are in there I would strongly suggest cutting out the plastic 3 pin plug and hard wiring the 3 yellow wires as many people have that plug melt/fail over time) then you need to check the regulator is working. The easiest way is to turn on the ignition and measure the voltage across the battery, then start the engine hold the revs at 2500RPM and remeasure the voltage across the battery. If the reading with the engine running is higher than without the engine running, then everything is probably okay. You should expect something around 14 volts with the engine running, but the manual will give you the exact voltage range expected at the battery.

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Re: three yellow wires

Postby woodward » Mon Mar 07, 2011 12:48 pm

Thanks, I had all ready hard wired a while back. I will undo my conections and preform the afor mentioned steps. Thanks again. TW
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Re: three yellow wires

Postby WingAdmin » Mon Mar 07, 2011 3:38 pm

woodward wrote:Thanks, I had all ready hard wired a while back. I will undo my conections and preform the afor mentioned steps. Thanks again. TW


No need to undo your connections - just follow the yellow wires up to where they plug into the rectifier/regulator, and unplug them there to test.
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Re: three yellow wires

Postby woodward » Mon Mar 07, 2011 4:53 pm

I removed that connection at the same time. I have 50 plus volts @ 2200 RPM and the stator ohmed out ok. Happy face. Would the fact that it's only putting out 13.3 and went into a discharge situation( I made it home at 8.8V) once warrent a 150 dollar regulator ? I think it's one of those if everthing else is good then replace regulator, am I wrong.
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Re: three yellow wires

Postby WingAdmin » Mon Mar 07, 2011 5:01 pm

I haven't seen a regulator fail gradually or intermittently - only ever heard of them going all at once, and never coming back.

Have you checked your master (dogbone) fuse? It can crack and fail intermittently, but look absolutely fine on a visual inspection.

Also check the sense line on the regulator - the one that "turns it on". I don't have it in front of me right this moment, but there are the three yellow wires, the red wires that are the output, ground, and the sense, which when supplied with +12V enables the regulator. If that sense wire has a bad connection or is otherwise not receiving +12V, your bike will stop charging, and it will drain the battery.
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Re: three yellow wires

Postby woodward » Thu Mar 10, 2011 11:49 am

Thank you all for the schooling. Cleaned the bone and ground lug. While running wiggled the 12 "turn on" from the # 5 fuse and can not get it into a fail condition. I sodered every thing back togeather and at least now I have the understanding for if and when it fails again. I need to do better looking at my guages. Always watching. TW
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Re: three yellow wires

Postby woodward » Tue Mar 15, 2011 1:49 pm

While waiting for engine to reach opperating tempture after timing belt replacement I noticed a no charge situation. Great, the top cover was all ready off and I started testing. The reg had 12 v from fuse panel, 12 v to/from dogbone fuse and the green wire (ground)circuit was complete. I cut the three yellow wires that I had sodered last week and found over 50 dcv in each set of wires when measured across all three pairs. What I didn't like was the erratic continuety to earth I found in each yellow wire while running. There is infinity ohms while the motor is off. What I can't grasp is how can you have a short to ground and still produce dc volts. With the yellow wires conected and enging running one has erratic continuity to ground. I can't be doing these tests correctly. I really don't want to pull this motor but I will............ TW
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Re: three yellow wires

Postby WingAdmin » Tue Mar 15, 2011 4:11 pm

Are you checking DC or AC on the yellow wires? You should be checking AC. Your meter could be picking up AC noise against ground and showing it in DC if your meter is set to read DC.
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Re: three yellow wires

Postby woodward » Tue Mar 15, 2011 10:38 pm

Mia culpa, the voltage across the three pairs of yellow wires un attached remains above 50 ac volts @ 2000rpm. For some reason I ohmed the same wires(running) to ground and got a reading altho erratic. This might not even be a test, they ohm out fine disconected, engine off 2 to 5 ohms between wires, infinity to ground. TW
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Re: three yellow wires

Postby thrasherg » Wed Mar 16, 2011 12:06 am

So all is good for the stator!! if you still have a problem you need to be looking at the regulator and wiring..

Gary
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Re: three yellow wires

Postby woodward » Sat Mar 26, 2011 7:49 pm

Apparently the reg was bad since I got the bike. Now i've got 14.4-14.5...sweet. Thank you all.....Tim


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