GL1100 80 model spark unit diagram?


Information and questions on GL1100 Goldwings (1980-1983)
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bigdirty1985
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GL1100 80 model spark unit diagram?

Postby bigdirty1985 » Wed Jul 13, 2016 7:18 pm



I have a bad spark unit on my gl1100 .and a new one is thirty bucks. it seems like they are pretty simple (thinking a transistor and a capacitor). i am pretty handy with a soldering iron and was wondering if anyone could explain exactly what is going on inside this thing.a diagram would be great but any discussion would help. thanks in advance.i have attached a partial diagram i made showing where the wires go i just need help with the magic box lol.
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virgilmobile
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Re: GL1100 80 model spark unit diagram?

Postby virgilmobile » Wed Jul 13, 2016 8:00 pm

Bout the best we/I can do is guess...You say yours is bad...That would be very rare...Is it actually bad by confirming and swapping with the other one? Or just the black stuff leaking out of the back of it..

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Re: GL1100 80 model spark unit diagram?

Postby bigdirty1985 » Wed Jul 13, 2016 8:07 pm

definitely bad. originally only 2 and 4 were firing and after swapping units only 1 and 3 were firing.

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Re: GL1100 80 model spark unit diagram?

Postby virgilmobile » Wed Jul 13, 2016 8:09 pm

Must have leaked the sealant material and got moisture in it.Is the other on about the same condition?
I'm gonna send you a PM.

bigdirty1985
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Re: GL1100 80 model spark unit diagram?

Postby bigdirty1985 » Wed Jul 13, 2016 8:16 pm

yeah the other looks just as bad but it still works. i figured i could refill it with jb weld or epoxy of some sort but i was hoping to be able to build a replacement and document the process for others because there is no excuse for these things being 30 - 100 dollars. its so black and gooey in there but it looks like a little disc capacitor from hot wire to ground and thats about it other than whatever causes the switching to occur.

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virgilmobile
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Re: GL1100 80 model spark unit diagram?

Postby virgilmobile » Wed Jul 13, 2016 8:28 pm

There would have to be some type of heat sink mounted FET,biasing resistors,decoupling cap(spike reducer)as a minimum.What the values of these parts are would be difficult to guess at.I suppose one could take a working one..dissolve the sealer and disect it to reverse engineer it.

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Re: GL1100 80 model spark unit diagram?

Postby virgilmobile » Wed Jul 13, 2016 8:38 pm

What other projects do you need help with?
That's why were here ya know :D
Sometimes advice sometimes stuff and a lot of questions.

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Re: GL1100 80 model spark unit diagram?

Postby bigdirty1985 » Wed Jul 13, 2016 8:39 pm

yeah i know that the case acts as a heat sink im hoping to discover how this works by dissecting the bad one. so far i see the cap and that is all looks like the rest is inside the aluminum which sucks. but my understanding is that this spark unit directly grounds the coil and when it gets a signal it breaks the connection to ground and then grounds through the cap? and that causes the spark? im kind of guessing really but i think im on the right track lol.

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Re: GL1100 80 model spark unit diagram?

Postby bigdirty1985 » Wed Jul 13, 2016 8:43 pm

my other machine is a 750 nighthawk 82 model it just needs a starter. I tried to rebuild it but when i opened it it was shredded beyond repair so ill have to get another. :(

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Re: GL1100 80 model spark unit diagram?

Postby virgilmobile » Wed Jul 13, 2016 8:48 pm

Check on line for a parts breaker called Rad Cycle here in Baton Rouge.They sometimes have stuff cheap.E-Bay just seems to be overpriced nowdays.Look at the "Vendor" section.I think there used parts placed listed there too.Just stay away from Saber Cycle.There reputation preceeds them.
You can always post in the Wanted section..even if it's not a wing...Some of have other bikes too.

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Re: GL1100 80 model spark unit diagram?

Postby virgilmobile » Wed Jul 13, 2016 8:50 pm

Your about right on the design.Some research about electronic ignition schematics may yeild more info.

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Re: GL1100 80 model spark unit diagram?

Postby bigdirty1985 » Thu Jul 14, 2016 1:45 am

ok so i have an idea of how this could work but there is a hole in it... if i use the pickup coil to generate voltage to the cap and diodes to restrict flow in one direction, i could switch the voltage with a transistor but it will be pulsing 4 times per rotation and i wont be utilizing the switched hot wire. so that means that isnt the correct function of the spark unit. but i dont have any ideas of a circuit that utilizes the switched hot wire.... i really have no idea what that could be doing in that circuit...

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Re: GL1100 80 model spark unit diagram?

Postby bigdirty1985 » Thu Jul 14, 2016 3:18 pm

well i have a new spark unit on the way. Thanks Virgil! but i still have a scientific interest in this subject i want to know how to make this darn thing .

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Re: GL1100 80 model spark unit diagram?

Postby virgilmobile » Thu Jul 14, 2016 3:31 pm

I use duckduckgo.com and typed in this...Honda electronic ignition module schematic...
Looked under images not web....Lots of schematics there...like this..
and this.
And this if you change your search to"simple electronic ignition circuit"

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Re: GL1100 80 model spark unit diagram?

Postby bigdirty1985 » Thu Jul 14, 2016 3:56 pm

i have the second diagram but i will study the first and third thanks.

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Re: GL1100 80 model spark unit diagram?

Postby bigdirty1985 » Thu Jul 14, 2016 4:45 pm

Ok i think ive got it guys! i am aware that my drawing looks like dog poop i will make a cleaner one later. :lol: but can anyone point out why this wouldnt work? . hot wire acts as switch and a homemade bridge rectifier converts ac to dc and sends signal twice per cycle and if im not mistaken these bikes have a wasted spark on the exhaust stroke from the factory so i think this is a clone of their system. (or maybe the extra spark is on the intake? anyone?)
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Re: GL1100 80 model spark unit diagram?

Postby Johnyy Smoke » Thu Jul 14, 2016 4:58 pm

Failure on these are rare, you can find them used on E-Bay for under $20. Regards, Johnny

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Re: GL1100 80 model spark unit diagram?

Postby bigdirty1985 » Thu Jul 14, 2016 5:05 pm

I've already got a pair on the way. but that's not the point. This is about SCIENCE!!! :geek:

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Re: GL1100 80 model spark unit diagram?

Postby Johnyy Smoke » Thu Jul 14, 2016 5:23 pm

bigdirty1985 wrote:yeah the other looks just as bad but it still works. i figured i could refill it with jb weld or epoxy of some sort but i was hoping to be able to build a replacement and document the process for others because there is no excuse for these things being 30 - 100 dollars. its so black and gooey in there but it looks like a little disc capacitor from hot wire to ground and thats about it other than whatever causes the switching to occur.

Well, Ok. Guess I just missed the point. Regards, Johnny

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Re: GL1100 80 model spark unit diagram?

Postby virgilmobile » Thu Jul 14, 2016 6:16 pm

The pulse coil will not produce enough voltage and current to bias the transistor to conduct.
I suspect if you unplugged your operating pulse coil and turned on the key,you would measure a bias voltage.When you plug the pulse coil back in it would drop to a few tenths.When the pulse coil is pulsed you will see the bias voltage change.The change is what triggers the FET.Ill also bet that the FET is biased to conduct all the time there's power applied and the pulse coil triggers it to turn off just like simulating points...They spark the coil when the points open not close.

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Re: GL1100 80 model spark unit diagram?

Postby bigdirty1985 » Thu Jul 14, 2016 8:37 pm

ok so i reworked it a little im kind of dead in the water as far as voltage right now(my multimeter has a new set of leads coming from ebay) so i cant test anything at the moment unless its hot or not with a test light. anyway how does this look? im not a super microelectronic genius but i have a basic understanding of things. were you saying the pickup coil wont produce enough current for the transistor to turn on? i thought it produced around 50 volts.

actually after looking at this i realized this circuit still wont work. apparently i got the stupid half way through making it because it still isnt turning anything off(in fact i have no idea what it IS doing haha! ) now im trying to figure out what WILL turn off the current
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Re: GL1100 80 model spark unit diagram?

Postby virgilmobile » Thu Jul 14, 2016 9:00 pm

The charging system stator coils can produce a unloaded voltage from 25 to above 70 volts AC.
The pulse coil will barley move the needle on the 2.5 volt scale.I did a test of that...
Note that with the key on and the pulse coil disconnected,there was a dc voltage (bias voltage) across the coil.
viewtopic.php?t=11800

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Re: GL1100 80 model spark unit diagram?

Postby virgilmobile » Thu Jul 14, 2016 9:04 pm

I wonder if a transistor were biased to near the turn on threshold (0.65 volts)and the pulse coil operated if the output (amplified) signal could be used to fier the FET to collaps the feild into the coil.

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Re: GL1100 80 model spark unit diagram?

Postby mytown » Sat Jul 16, 2016 2:41 pm

Your mom is going to kill you!

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Re: GL1100 80 model spark unit diagram?

Postby virgilmobile » Sat Jul 16, 2016 3:29 pm

Here's 2 more comprehensive circuits that have similar results. :D :roll: :lol:
and my favorite.




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