1985 Pulse Generator out put

Information and questions on GL1200 Goldwings (1984-1987)
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1985 Pulse Generator out put

Postby hdriderbb » Sun Mar 14, 2010 1:51 pm

I have read a lot of the forums in here about the pulse generator, but I would like to know actual out put. Does any one know what the AC output voltage should be on the pulse generator for a 1985 Goldwing? The service manual says 1200 +/- 100 ohms @ 68 degrees, but it does not give AC volts. My results in ohms in lower than the manual states, but when I am getting the lower results even when it runs good. Are the spec in the service manual I listed correct?

I am getting about 400 ohm (lower than the spec) from each pulse generator coil and .097 acvolts. I get these results even when the engine is running great and hot. The same result when the engine is cold (first thing in the morning). This morning it was about 50 degree.

The bike will start up and run great up until the 4th temp bar, then it dies. Turns over and does not start and the spark is gone (I checked with the spark plug cap off and put the wire on the head). It will start about 2 minutes later and the it spark jumps about 6mm from the wire, which is good. Once it restarts it runs great the rest of the day and does not die again.

I only have a couple minute window to test stuff, since it start in a couple minutes. I know it is spark related, since I verified it is not sparking.

I am getting to go and try some more stuff. I would like to verify their is an open or something in the pulse generator before I replace it. I am going to try to test it within the "2 minute" down time on the first kill of the day!

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Re: 1985 Pulse Generator out put

Postby WingAdmin » Mon Mar 15, 2010 9:36 am

The specs you quote (1.1K - 1.3K) are correct for the resistance of the pulse generator coils. 400 ohms is definitely much too low, and could indicate failed/shorted coils. If this is the case, they might generate a tiny pulse, just enough for the electronic ignition to detect - sometimes.

If they definitely are reading only 400 ohms (when disconnected from the ignition box, of course), then I'd look at replacing the pulse generators.

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Re: 1985 Pulse Generator out put

Postby tricky » Mon Mar 15, 2010 10:23 pm

I replaced the PG's on my 85 ASpy about 7000 miles ago, early 2009.

The bike would fart, miss, run, fart..... It didnt dawn on me to suspect the PG's I was always under the impression that it was either a go or no go depending on the heat of the PG's.
It sounded more like a carb or fuel problem. I dint want to touch the carbs, they were running fine when I put the bike to sleep for the winter. I replaced the fuel, replaced the fuel filter, checked the flow of the fuel pump, I even measured the PG's and even on the bench with a heat gun they tested within the specs.
I was going to do the carb's but fortunately someone said change the PG's.......

It was the easiest thing to do I figured if it wasnt them at least I would have a spare set.

Changed them...... been running fine since....

Just food for thought before jumping into something that doesnt need touching.

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Re: 1985 Pulse Generator out put

Postby tjack64 » Fri Mar 26, 2010 8:49 pm

Had the same problem. Replaced the pulse generators on My 86 Interstate, after reading a few forums and the advice on this one. Goldy runs great now, no more shutting off. Can trust it now. Replace the pg's You won't regret it. Keep the forum informed.


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Re: 1985 Pulse Generator out put

Postby cooter » Fri Mar 26, 2010 9:17 pm

ditto here: replace PGs .(trigger coils) common problem especially if original 24yrs ?

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Re: 1985 Pulse Generator out put

Postby ltd1200 » Mon Mar 29, 2010 3:39 am

The problem with the 1985 goldwing isn't the generator or the voltregulator.
Most of the time it are the connections to the generator and the voltregulator, they are getting dirty and rusty.
Because these conection are covert with plastic jou don't see them.
Don't clean them just cut them out and make a strait connection with a waterproof strayt connection.
It provents a lot of trobble and gives you more time and fun to ride

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Re: 1985 Pulse Generator out put

Postby roc_spence » Sun May 02, 2010 7:47 am

I had a similar problem with mine. Some one suggested the PG and the white poly wire connector. Did the PG and hard wired the connector.... NO problems since. Should have found and listened to the group forum right from the start. Would have saved me BIG money on other parts and made me happier sooner. Check the connector and replace the PG . Happy riding

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Re: 1985 Pulse Generator out put

Postby lyleapgmc » Mon Jun 07, 2010 6:45 pm

When you check the resistance, ohms, of the pulse generators are you disconnecting them from the circuit? If not the readings will be effected by the module they connect to. You can not get a good resistance reading of a circuit component with it still connected to the circuit.

Replacing a component sometimes cures an intermittent or subtle problem. With bikes that are approaching 30 years of age I have to wonder how many times the real problem was with the connectors. The do corrode and gather road dirt and grime over the years. I would certainly clean thoroughly the connectors before I condemned the component. Pack the connector with dielectric grease and reconnect.

The same thing applies to newer vehicles when the parts replacement technician puts the diagnostic computer on the car and it says the MAP sensor is bad or the oxygen sensor is bad. Replacing the part tends to re-establish the connection and it all works fine, for a while.


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Re: 1985 Pulse Generator out put

Postby WingAdmin » Tue Jun 08, 2010 12:37 pm

lyleapgmc wrote:parts replacement technician


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Re: 1985 Pulse Generator out put

Postby vmipat » Mon Jul 19, 2010 12:00 pm

My 87 has a power problem, as in lack of it. i replaced the carbs, vacuum lines, Ignition Command Unit and plugs. i tested the spark plug coils and they came in at 24-25k as the book calls for. i then checked the pulse coils and got only 365 - 425k depending on how hot they were, 90+ in my garage. i think this is the last thing i am going to replace. If this does not work, its parted out.

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Re: 1985 Pulse Generator out put

Postby hotwire » Sun Aug 19, 2012 10:22 pm

I've been having issues with my 85 Aspy backfiring, stopping like you turned off the switch, etc, after a few minutes, (maybe), starting right back up.
I removed my pulse coils, took them to the local Honda dealer and had them checked by their mechanic, said they are o.k. I understand,(maybe wrongly), that the spec in the book, 1200 ohms or so, is for 84 models, and 85 is 330 ohms, plus or minus 10 percent. Also, if you are checking them on the bike, even with the connector unplugged, if the pickup coil is on the crank trigger, it may read open. I tried this with mine out of the bike by making a sure connection to the ohmmeter and passing the pickup on the pulse coil over a piece of metal, and sure enough, it goes open and then makes again to original value. If that helps?? Still don't know what's ailing my bike. (Maybe the mechanic was wrong, according to what I'm reading)

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Re: 1985 Pulse Generator out put

Postby zenair » Tue Aug 28, 2012 4:15 pm

A bit of additional information on the pulse generators. I'm completely refurbishing my 1986 GL1200 Aspencade. As part of the process, I've checked the pulse generators, while unplugged. They read 332.5 and 333 ohms each. Since both the Honda shop manual and Clymers manual indicate that the generators should read 1200 ohms +/- 100 ohms, I ordered new ones from Babbit. The new OEM Honda parts arrived today. Both of the new generators read 334 ohms each. Obviously, the 1200 ohms indicated in the manuals is for the earlier 1984 models of the GL1200 which are mounted on the rear of the engine. Hope this info helps someone and saves them some money.

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