No spark?!


Information and questions on GL1200 Goldwings (1984-1987)
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gmonty
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Joined: Tue Feb 21, 2017 9:59 pm
Location: Nashville TN
Motorcycle: 1985 GL1200 Aspencade

No spark?!

Post by gmonty »



2 weeks ago I purchased my first Goldwing. 1985 Aspencade with 14,250miles. Before I tried starting it(I bought it not running) I took the carbs off and cleaned them, checked and replaced fluids, puts new gas in, and checked spark. I got it to run for about 10 minutes and it came up to operating temp then shut off. I have not been able to get it started again. I replaced the main fuse/starter solenoid because the plastic was melted and there was an intermittent short when I was trying to start it. The motor cranks. One thing I have noticed is that when I was first trying to start the bike an rpm of around 350 would register but now the bike is reading 0 when it is being cranked. How do the aspencades get their rpm reading? I have done a lot of reading on this site and others trying to figure out what the next thing to check is. I have checked the pulse generator resistance and they read 334 and 335 which from another thread is supposed to be correct for an '85. I have checked the coils which both seem to be up to spec as well. I checked the horn because it was said in another thread that the ground for the horn and the ignition box is the same and that worked. Is it possible that my pulse generators are bad even though they read the right spec? Is is possible that the ICU is bad? I am running out of things to test and I do not know this bike very well yet. I am eager to get it on the road and would appreciate any help in solving my problem!



gmonty
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Motorcycle: 1985 GL1200 Aspencade

Re: No spark?!

Post by gmonty »

New symptom. The 10amp ignition fuse is now blowing when I turn the engine over almost instantly. Is this a problem with the cdi?

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virgilmobile
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Re: No spark?!

Post by virgilmobile »

This is interesting .
Sorry I'm late here.The 10 amp fuse...Does it blow when the key is turned on or only when the bike has been cranked.?

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virgilmobile
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Re: No spark?!

Post by virgilmobile »

I'll also post this schematic.
The pulse coils will not blow the 10 amp fuse.



gmonty
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Motorcycle: 1985 GL1200 Aspencade

Re: No spark?!

Post by gmonty »

The fuse will only blow when the engine cranks. It will last anywhere from 1-2 seconds before it blows.

gmonty
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Re: No spark?!

Post by gmonty »

Now the engine is starting then immediately dying. Is this a wiring problem?

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virgilmobile
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Re: No spark?!

Post by virgilmobile »

Starts then dies.Does it still blow the fuse?Does it start back up again?
Still gathering information.I'm looking over the wiring now.

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virgilmobile
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Re: No spark?!

Post by virgilmobile »

This may sound odd but,other than a bad ignition module,the only other thing the schematic shows as a possible load is the regulator/rectifier module.Easy enough to unplug and retest.



gmonty
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Joined: Tue Feb 21, 2017 9:59 pm
Location: Nashville TN
Motorcycle: 1985 GL1200 Aspencade

Re: No spark?!

Post by gmonty »

It will run for right around a second and then blows the fuse. How would i test the regulator?

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virgilmobile
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Re: No spark?!

Post by virgilmobile »

Simply unplug it. See if it keeps running. It won't charge the battery but can verify of its the cause of the excess. Current draw

gmonty
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Re: No spark?!

Post by gmonty »

I unplugged the regulator and tried it again. It did the same thing

gmonty
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Re: No spark?!

Post by gmonty »

I did a test. I cranked the engine with the kill switch in the off position. It did not blow the fuse but as soon as it was put in the on position it blew the fuse again

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virgilmobile
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Re: No spark?!

Post by virgilmobile »

Ok..last thing I can come up with to seperate the load on the fuse...Disconnect the fuel pump or pull the pump relay.It also gets its power from that fuse...and it is only operating when there's ignition operating.

gmonty
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Re: No spark?!

Post by gmonty »

I unplugged the pump from the wiring harness and the fuse did not blow. That being said does that isolate the pump as the problem or is it possible the relay is an issue?

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virgilmobile
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Re: No spark?!

Post by virgilmobile »

At least it appears the ignition module is working and the pump circuit is blowing the fuse.Its unlikely the relay is blowing the fuse.Its a electric switch.If the pump is full of trash and turning very hard,it will draw a bunch of power as it loads up.
Also,you just proved that by disconnecting just the fuel pump,the system works.
I'm suspecting the pump needs tending to.Perhaps a cleaning.

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virgilmobile
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Re: No spark?!

Post by virgilmobile »

Unfortunately there's no current draw specs for the pump.I would be taking a guess that it should draw less than 2.5 amp to run the fuel pump. I do know that if they are overloaded by trash in the impellers, it will draw a significant more power to keep running.
If your so inclined, you could gravity feed the carbs and leave the pump disconnected to be able to continue your testing the bike.
Keep us posted.
Good job in isolating the problem.I do appreciate your ability to identify the symptoms.They do help to narrow the problem.

gmonty
Posts: 15
Joined: Tue Feb 21, 2017 9:59 pm
Location: Nashville TN
Motorcycle: 1985 GL1200 Aspencade

Re: No spark?!

Post by gmonty »

I replaced the fuel pump and the bike started and ran for about 10 seconds then ran out of fuel. Pump is kicking on but it doesn't shut off once I crank the engine, even after the engine stops cranking the pump still runs. I think the fuel pump I had on the bike had a problem but now I am thinking that the relay is bad. from what I have read, the pump is only supposed to come on for around a second every 8 seconds. Is this right? or is it supposed to stay on once the engine is running?

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virgilmobile
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83 GL1100 I
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84 GL 1200 I

Re: No spark?!

Post by virgilmobile »

As I read the schematic, the relay is suppose to engage when there is spark.As the spark increases in duration so does the relay.Replace the relay if your pump won't shut off.





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virgilmobile
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Joined: Sun Sep 19, 2010 5:39 pm
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82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: No spark?!

Post by virgilmobile »

By the way.Good catch about the pump still running.It may have been what damaged the original pump.
Keep a keen eye and ear..I'm sure you'll be able to sort out the problems.



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