chassis ground location


Information and questions on GL1100 Goldwings (1980-1983)
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wingman12
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chassis ground location

Postby wingman12 » Thu Jan 29, 2015 3:22 pm



I am new to posting questions on this site so bear with me. I have learned volumes of information from the folks with knowledge about goldwings, I am in the final stages of brings a 1982 GL1100 interstate back from the grave. This bike was so neglected over the last 14 years. I have replaced almost every mechanical part of this bike except for the actual engine and internal parts. My last hang up is now that the 3 yellow wire problem is resolved the stator is charging 15 volts either at idle or 5500rpm. when the cooling fan comes on the volts drops down to 4.0 - 4.1. I suspect it is a corroded chassis ground but I can not locate it. does anyone know where I might find this ground or is there another issue concerning the overcharging.
Some back ground on the electrical, the only incendiscent light still on the bike is the head light, all running, turn signal and brake lights are now LED. Testing of the 3 yellow wires required cutting out plug and sodering together, same with the black wire from the regulator, I cut and sodered all 8 of these also. voltage still high.

wingman12
Ingleside, Il



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dingdong
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Re: chassis ground location

Postby dingdong » Thu Jan 29, 2015 4:34 pm

Located behind the triangular motor mount on the left side of the bike just under the petcock.
Tom

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wingman12
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Re: chassis ground location

Postby wingman12 » Thu Jan 29, 2015 5:04 pm

thanks DingDong, but is that the only ground, I thought I read somewhere that there is a chassis ground for the green wires that come off the voltage regulator??

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wingman12
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Re: chassis ground location

Postby wingman12 » Thu Jan 29, 2015 5:41 pm

Thanks to a thread I bumped into on this site, apparenly there is one of the green wires from the rectifier/regulator that goes to the fuse box and the other to a chassis ground under or near the coils. I will have to check that out and let you know.

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Wilcoy02
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Re: chassis ground location

Postby Wilcoy02 » Thu Jan 29, 2015 7:20 pm

yes there is a ground connected to the steering neck around the the coils.

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Re: chassis ground location

Postby WingAdmin » Thu Jan 29, 2015 8:07 pm

First figure out if this is your problem: Put a voltmeter on your bike: one lead on the green wires at the rectifier, the other at the battery, connected to the ground terminal. With the bike running, in a perfect world, you should see zero volts. The more volts you see, the more of a grounding issue for the rectifier that you have.

rkmason
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Re: chassis ground location

Postby rkmason » Thu Jan 29, 2015 9:15 pm

On my '81 Interstate I located a chassis ground lug under one of the ignition coil asm bracket-to-frame mounting points as previously mentioned. I also found another chassis ground point in the front fairing. It was attached to the radio mount plate in the left-lower pocket of the fairing. That ground point path was intended to go thru the metal fairing mounting structure into the frame which seemed a very poor design.

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wingman12
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Re: chassis ground location

Postby wingman12 » Fri Jan 30, 2015 12:05 am

Thanks for the new leads. I will strip the seat and dummy tank over the weekend and retest the green wires coming out of the rectifier and let you know what I find out from your suggestions.

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Re: chassis ground location

Postby wingman12 » Mon Feb 09, 2015 9:27 pm

Well I am about a week later than expected but with Super Bowl and about 17 inches of snow on Super Bowl sundayand the cold weather returning I did not feel like working in the unheated garage. Today did however and I don't like the results. Tested both green wires to ground on the battery and got between 23 to 25 volts. Tested the battery and it showed 14.87. Does this mean the regulator is shot? Or does this mean I have a open chassis ground?

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Re: chassis ground location

Postby WingAdmin » Tue Feb 10, 2015 1:20 pm

wingman12 wrote:Well I am about a week later than expected but with Super Bowl and about 17 inches of snow on Super Bowl sundayand the cold weather returning I did not feel like working in the unheated garage. Today did however and I don't like the results. Tested both green wires to ground on the battery and got between 23 to 25 volts. Tested the battery and it showed 14.87. Does this mean the regulator is shot? Or does this mean I have a open chassis ground?


Yeah, that's not right. In all likelihood your regulator is OK, it's just a bad ground. Follow those green wires and figure out where they are getting their ground, then find out why they're not getting it correctly. Also check the battery ground itself - follow from the battery to where it connects to the chassis, make sure it's got no voltage showing between those two points when the bike is running.

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wingman12
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Re: chassis ground location

Postby wingman12 » Tue Feb 10, 2015 1:40 pm

ok. Thanks. I will take the wiring harness apart only after locating the chassis ground on the steering neck

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Re: chassis ground location

Postby wingman12 » Thu Mar 05, 2015 5:56 pm

Thanks for the location of chassis ground, I found it, cleaned up the frame and the connector and the condenser brackets, still the same high voltage issue.
However another unrelated situation was located while running the bike. It idles at 950 real smooth, gradual increase of throttle seems to work fine, (still have snow on ground in the northern part of the land of Lincoln) so I can not ride test the bike yet. I did notice however that when test the throttle response quickly several times I get a serious gas leak somewhere above the accelerator pump. the leak is not there when not running or when running, only when multiple quick throttle response movement is done. the more quick turning of the throttle the more the gas flows, quit the turning up of the throttle and in a few seconds, the gas flow stops. I am stumped and am hoping I do not have to remove the carbs to repair the problem. Anyone got any ideas??

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Re: chassis ground location

Postby auctioneeral » Sat Mar 07, 2015 6:29 pm

sounds like the accelerator pump is leaking at the O-ring.

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Re: chassis ground location

Postby WingAdmin » Mon Mar 09, 2015 10:19 am

Yep, accelerator pump. Not something you're likely going to be able to get to/fix with the carbs on the bike.

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wingman12
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Re: chassis ground location

Postby wingman12 » Mon Mar 09, 2015 1:01 pm

Thanks. I figured as much,but wanted expert opinions before removing the carbs again.

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Re: chassis ground location

Postby wingman12 » Fri May 01, 2015 5:20 pm

I see that I have not updated anyone on my issues with 1982 gl1100. The ground issue has somewhat been reduced by cleaning up the chassis grounds and running a ground off the fuse box to a chassis ground. I think a lot of my issue is that I have converted all but the head light and 2 (oil pressure and neutral lights) with LED and the charging system is putting out juice that is not being used. at idle the volts is 12.8 to 13.1. under full power volts are 14.8 to 15.1.

Fuel leak was defiantly the accelerator pump. I ordered a carb rebuild kit from Randakks and began the disassembly and removal of all of the 33 year old o'rings etc. some of the o'rings were petrified rubber that broke when touched. I soaked In strong carb cleaning acid bath, scrubbed, drowned in parts cleaner and replaced 4 low idle jets and one air/fuel screw. two days later all polished and bench balanced and tested for leaks and operations, reinstalled and after a few seconds of cranking she fired up and purred like a kitten. warmed her up to running temp and put the vacuum gauges on and synchronized the carbs a final time. put her cloths back on and next day took her for a 100 mile test run, low and high speed. she ran great and got 40.6 mpg. time to give the bike back to her owner. I will get some pictures of the finished product shortly because I know everyone loves pictures of these old girls

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wingman12
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Re: chassis ground location

Postby wingman12 » Sat May 02, 2015 12:04 pm

I was able to get a few pictures today of this pretty old girl that I returned from the grave. stored for about 12 years and was terribly neglected. only had 63,000 engine is good but everything else had to be replaced. I added much LED running and turn signal lights and brake lights are also LED both the strip on the trunk and the large stock lens has led strips on the inside for running and brake.

rkmason
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Re: chassis ground location

Postby rkmason » Sat May 02, 2015 12:59 pm

Nice recovery job. Having done the same thing with an '81 GL1100I between Aug '14 and Feb '15 I am familiar with what you did with this one; yours and mine are even the same color. Sounds like you had more to do to yours to bring it back. Mine had set in an enclosed bldg for 18 years so the elements were not quite as hard on it. Biggest work items for me were the brakes and the fuel system / carbs. Both required total rebuilding.

I found electrical grounding problems like you did. Worst ground problem I had was in the front fairing. Grounding for all front lights is routed thru the radio/intercom mounting plate into the fairing support structure and then into the frame which seems a poor ground path for so much current. I added a supplemental ground wire connected to a ground lug behind the headlight that goes out of the fairing and connects to an unused main frame harness ground wire lug in the wiring junction box behind the fork weight. it provides a much more reliable grounding path for all of the front fairing lights.

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wingman12
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Re: chassis ground location

Postby wingman12 » Sat May 02, 2015 1:12 pm

I was pretty fortunate on the light problems, mostly in the rear where someone had installed a light bar and other electrical things that were not there anymore. I removed the light bar, the lady I did the work for did not like the look of the light bar. Had to solder the 3 yellow wires, and the wires off the regulator also, the plugs were falling apart and very poor if any connections on some of the wiring within the plug. other than a little over charging now that I have cleaned up all of the chassis grounds she is good to go. we just need the weather to cooperate and away we go. The wx is beautiful today so I am going to sign off for now and hit the wind before mother nature changes her mind - again-.
Good luck with mounting your trunk. If I can be of any assistance please feel free to contact me.

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bruce swaybill
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Re: chassis ground location

Postby bruce swaybill » Tue May 05, 2015 12:23 pm

Does anyone have a photo of just where this chassis ground point is?

Thanks.
Bruce S.
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wingman12
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Re: chassis ground location

Postby wingman12 » Tue May 05, 2015 6:39 pm

Bruce, there are two chassis grounds on these older bikes, 1- follow the negative cable from your battery and it will lead you to a triangle shaped plate with 3 bolts. the ground is on one of these, clean up both the chassis and shine up the connection on the cable, inspect the cable for cracks etc.
the 2nd chassis ground is a green wire off your regulator that is located under the coils by the steering head on the frame under the false tank and air cleaner box. you have to remove the coils to get at the ground bolt to the chassis.




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