Wiring questions on my 1977 Goldwing


Information and questions on GL1000 Goldwings (1975-1979)
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Roffeman
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Wiring questions on my 1977 Goldwing

Post by Roffeman » Fri May 24, 2019 6:17 pm



Hi Wingers,

New guy here. I am in the process of getting a 1977 going again.

I am big on mid seventies BMW R bikes but when this bike found me, I was pretty intrigued. It has a lot in common with the BMW's as in boxer motor, shaft drive etc. but still very different. I think they are rather sophisticated bikes and in many ways under appreciated.

It has been sitting for a while so I am doing the usual, carbs, brakes, belts etc.
Looks like someone have been here before as some wires were disconnected. No big deal for the most part but I may have some missing parts.

The handle bar switches were off so I reconnected them to the main harness just so I can test fire the bike.
One of the leads (black with brown identifier) from the stop/start switch does not have a home in the main harness.


I am pretty sure it is this wire:


If so, it connects to a resistor. What resistor? The one on the coils? I don't see a female anywhere but again, I may be missing parts.

Also, where are/should the condensors located?

Curious: What does the large resistor on the "tank" left side panel do?

Appreciate any pointers, look forward to riding this bike.

Cheers,


Rolf

DaveO430
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Re: Wiring questions on my 1977 Goldwing

Post by DaveO430 » Fri May 24, 2019 7:28 pm

Is that not it just in front of your thumb? Yes the resistor on the coils is where it gets to eventually.
The condenser is on the front side of the battery box.
Don't know what "resistor" you are referring to on the "tank" but it could be the lighting module, toward the rear.

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Roffeman
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Re: Wiring questions on my 1977 Goldwing

Post by Roffeman » Sat May 25, 2019 9:25 am

DaveO430 wrote:
Fri May 24, 2019 7:28 pm
Is that not it just in front of your thumb?

No, there is not any female with that color in that harness.

Yes the resistor on the coils is where it gets to eventually.

OK, there are no wires emanating from the coil or coil area. Is there a separate lead that I am then missing?


The condenser is on the front side of the battery box.

Thanks, will check.

Don't know what "resistor" you are referring to...

The silver/gold galvanized 1×2 ish inches that sits about in the middle. It says "RESISTOR" on it. Just curious...
Rolf

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Re: Wiring questions on my 1977 Goldwing

Post by DaveO430 » Sat May 25, 2019 9:46 am

I guess my eyes deceive me but what color is that single female connector almost dead center in your picture?

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Roffeman
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Re: Wiring questions on my 1977 Goldwing

Post by Roffeman » Sat May 25, 2019 10:52 am

DaveO430 wrote:
Sat May 25, 2019 9:46 am
I guess my eyes deceive me but what color is that single female connector almost dead center in your picture?
Hi Dave, the photo may be deceiving, I and a friend have checked and rotated all of them and none are matching.

Do you think that lead should come out of that part of the harness or would it be a separate wire? It certainly make sense if it would and maybe something have been cut.

Looks like the previous owner "fixed" the dead ignition coil resistor by just adding another 2 ohm resistor on it's side. I removed both as I will source a stock style ceramic resistor. While doing that, I did not see any wires around that area not in use or with that color.

Thanks again for taking the time.
Rolf

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dingdong
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Re: Wiring questions on my 1977 Goldwing

Post by dingdong » Sat May 25, 2019 11:15 am

Does your bike still have points or has an electronic ignition been added? If electronic then that added 2ohm resistor may be there for a reason. Also if electronic you don't need the condenser. The resistor on the left side is used with the reserve lighting unit. For a description of the reserve lighting unit go to this site and scroll down to problem 5. http://www.randakksblog.com/headlight-troubles/
Tom

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John F. Kennedy would be impeached by todays liberal Democratic socialist party.

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Roffeman
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Re: Wiring questions on my 1977 Goldwing

Post by Roffeman » Sat May 25, 2019 12:52 pm

dingdong wrote:
Sat May 25, 2019 11:15 am
Does your bike still have points or has an electronic ignition been added? If electronic then that added 2ohm resistor may be there for a reason. Also if electronic you don't need the condenser. The resistor on the left side is used with the reserve lighting unit.
Tom, thanks, so the big resistor works in conjunction with the RSU. If all of this works well, I certainly will leave it alone. Will dive deeper in to this later, first I want to hear it run.

I am not at the shop today, will check to see if points were replaced and look at the battery box to see if condensets are still there. I think the owner added the 2 ohm resistor as the OE unit was defective. I tested it, no contact period.

Still looking for where that darn wire connects to. If anyone in WA state would let me look at theirs, I'll bring the Starbucks.
Rolf

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Re: Wiring questions on my 1977 Goldwing

Post by Shadowjack » Sun May 26, 2019 8:23 am

On my 77, coil current comes FROM the ballast resistor to the killswitch on the black/brown wire and back to the coils on the black/white wire. The black/brown wire from the killswitch plugs into a black wire with a brown tube in the main harness, which splits to the ballast resistor and to the ignition bypass diode. The ballast connector is a black wire with a brown tube, the diode has a special plug in the left shelter.
When cranking, power comes down from the start button to the starter solenoid on the yellow/red wire and splits off through the diode back up through the black/brown wire to the killswitch. This bypasses the ballast resistor so the coils get all the battery voltage there is. The diode is in there so the starter solenoid won't be backfed power from the ignition circuit when the start button is released.

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Roffeman
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Re: Wiring questions on my 1977 Goldwing

Post by Roffeman » Sun May 26, 2019 9:36 am

Thank you very much for that comprehensive reply. I am going to open up the wiring harness and dig for that black/brown lead. It must be there!

Knowing Honda, they would not run a separate lead but it is possible that the previous owner been enthusiastic with the Knipex.

I will be back at the shop Tuesday and will back.
Rolf

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Roffeman
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Wiring 1977 Goldwing, update!

Post by Roffeman » Sat Jun 01, 2019 12:05 pm



Found it! Got it wired up and hooked her up on IV fuel. Oh' boy does these flat fours sound great.

So now with the motor running, I will get going with all the rest: brakes, tires and some serious detailing and polishing.




Rolf

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