Neutral Switch Wiring 81 GL1100 vs 83 GL1100A


Information and questions on GL1100 Goldwings (1980-1983)
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CoffeeNinja
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Motorcycle: 1983 GL1100A Aspencade

Neutral Switch Wiring 81 GL1100 vs 83 GL1100A

Post by CoffeeNinja » Wed Sep 12, 2018 5:27 am



Hello all!
Long story short, I picked up a beautiful fully loaded 83 Aspencade last autumn.
Took it out this spring, and misunderstood that the bike had not had routine service.
The first cold morning ---WHIZ BAM--- clunk clunk clunk -- I now have a hole in the a piston, and a missing valve.
I did the thing you are not supposed to do, and didn't change the belts (yeah.. I know).

However, I had some luck and got a hold of an 81 Interstate Engine with low miles and have prepared it to swap into the bike.
I noticed now, after having both engines sitting next to each other, that 83 has a 6 pin wiring harness (braided cable, coming from the transmission?) and the 81 does not.

Questions:
1)Is it possible to re use the 6 pin wiring from the 83 engine (gear selection) and swap it to the 81?
2)In the case of the above not being practical, how do I get around this?
3)Are there other concerns I should be aware of when using an Interstate model GL1100 in an 83 GL1100A set up?

Clearly I at least need to have the Neutral Switch wired up.
The bike is the full digital model.
This is my first time doing all of this, and I am handy enough to have gotten this far.

I have removed both engines, adjusted the valve timing, put on new belts, etc just from the how-to's on this forum. So I greatly appreciate this resource and all of your help.

Pictures can be provided.

Thank you thank you thank you



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virgilmobile
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Re: Neutral Switch Wiring 81 GL1100 vs 83 GL1100A

Post by virgilmobile » Wed Sep 12, 2018 7:36 am

Sheesh...without both of them side by side and removing the front cover I couldn't say...
I suspect that the 83 has multiple wires to feed the display gear indicator where the 81 only needed the neutral lamp.
What would you loose? Obviously the gear indicator and cruise if it's outfitted.
If these are not necessary,just use the neutral wire.
As to swapping...I've never tried but you'd have to remove both covers and see if the mechanism(shift drum) is built the same as the other and the cover is the same(with the exception of the gear selector switch)...a dry test fit and function test to see if it actually works.Verify with a ohm meter that when in neutral that the neutral wire goes to ground...The switch can be turned 180° off.

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WingAdmin
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Re: Neutral Switch Wiring 81 GL1100 vs 83 GL1100A

Post by WingAdmin » Wed Sep 12, 2018 9:15 am

I'm pretty sure the later switch with the multiple contacts for each gear bolts into the exact same place on the inside of the engine cover as the neutral switch did on the earlier bikes. Then just feeding the wires through that grommet should be the only other step taken.

You will need a new gasket for the engine cover, as you'll have to replace it before reinstalling it.

Oh...and some friendly advice: change the belts on your new engine before starting it. :)

CoffeeNinja
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Motorcycle: 1983 GL1100A Aspencade

Re: Neutral Switch Wiring 81 GL1100 vs 83 GL1100A

Post by CoffeeNinja » Wed Sep 12, 2018 9:23 am

Image

It looks like this one here. Except the braided cable has six wires instead of two. And the engine that I am swapping into the bike doesn't have any braided cable.

Yeah, thanks WingAdmin :)

Luckily, this time, I have gone through much pains to replace, calibrate, and retest the belts and timing. Hand turning the engine; everything lines up and is sounding and feeling smooth.
That's why I got to this point of now even starting to consider actually INSTALLING the engine! Whew.

CoffeeNinja
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Motorcycle: 1983 GL1100A Aspencade

Re: Neutral Switch Wiring 81 GL1100 vs 83 GL1100A

Post by CoffeeNinja » Wed Sep 12, 2018 9:45 am



Here is the 81 engine. You can see a little circular spot with a screw where I assume I'm supposed to screw down an end of a cable from the Instrument panel or something.




And here you have the 83 Aspencade original engine. There is the 6 pin connector and braided cable. It goes through a grommet straight to the neutral switch.
The 81 engine may not have a spot for this braided cable to go through. However, I could use the 83 cover on the 81 engine. Right?

DaveO430
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Re: Neutral Switch Wiring 81 GL1100 vs 83 GL1100A

Post by DaveO430 » Wed Sep 12, 2018 7:36 pm

Yep, the neutral switch on the 81 is on the side of the block and the 83 is in the front cover. Not sure if the fork from the 83 will work on the 81 shift drum, haven't tried that. You would have to use the 83 front cover which will fit, no problem.

CoffeeNinja
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Re: Neutral Switch Wiring 81 GL1100 vs 83 GL1100A

Post by CoffeeNinja » Thu Sep 13, 2018 5:16 am

Yeah, I was thinking of using the front cover from the 83, since it already has the hole and grommet fit perfectly.
However I am not sure what you mean by the fork, or shift drum. Can you clarify?
Would it be as easy as plug and play if I use the 83 front cover? That sure would be amazingly nice.

DaveO430
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Re: Neutral Switch Wiring 81 GL1100 vs 83 GL1100A

Post by DaveO430 » Thu Sep 13, 2018 7:16 am

CoffeeNinja wrote:
Thu Sep 13, 2018 5:16 am
Yeah, I was thinking of using the front cover from the 83, since it already has the hole and grommet fit perfectly.
However I am not sure what you mean by the fork, or shift drum. Can you clarify?
Would it be as easy as plug and play if I use the 83 front cover? That sure would be amazingly nice.
In your first picture above, you see the neutral switch in the front cover and the pin across it. On the front of the engine the part that it mates to is what I called the fork, it is on the end of the shift drum.



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