Tail lights


Information and questions on GL1200 Goldwings (1984-1987)
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vBreezo
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Joined: Fri Apr 20, 2012 2:54 pm
Location: Roxboro, NC
Motorcycle: 1985 GoldWing 1200 LTD

Tail lights

Postby vBreezo » Mon May 21, 2012 12:05 pm



1985 GL1200 LTD: Both taillights went out at the same time but brake lights still work. I checked all the obvious things: replaced the 15 amp fuse; tested both taillights - both are good; checked all connections from trunk to light assembly, could find nothing wrong. What else could cause both taillights to go out at the same time?



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virgilmobile
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Re: Tail lights

Postby virgilmobile » Mon May 21, 2012 1:52 pm

You can download the whole schematic but here's the best part.
Determine which you have lost first.Either the volts or the ground.
Use a 12 volt test probe (lamp) and turn on the key.Probe the brown wire going into the brake/tail light socket.
Expect it to light the test light.
If it does not, probe each side of the fuses for volts.A fuse can sometimes "look" good but be cracked in the end.
Next probe the green wire right at the lamp socket.It should not light up.
If it does,you have no ground connection.
All this is for the center brake/tail light...The other lights are on a different circuit,they are powered from a sensor module shown in the schematic on the right.

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vBreezo
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Re: Tail lights

Postby vBreezo » Tue May 22, 2012 6:18 pm

Virgilmobile: T Y for the info; the schematic is a big help. I have determined that it is not a faulty connector or relay but a short somewhere in the system. Since most of the wiring runs in a protective sleeve, the only place it should be able to short out is anywhere that exposed wires pass close to a metal surface. So for starters, I will pull the sidebags to examine the wires at that point. If not there, it will become much more difficult to track down the short.

Any pointers or advice from those who have gotten into the wiring harness would be appreciated.

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Re: Tail lights

Postby WingAdmin » Wed May 23, 2012 11:37 am

vBreezo wrote:Virgilmobile: T Y for the info; the schematic is a big help. I have determined that it is not a faulty connector or relay but a short somewhere in the system. Since most of the wiring runs in a protective sleeve, the only place it should be able to short out is anywhere that exposed wires pass close to a metal surface. So for starters, I will pull the sidebags to examine the wires at that point. If not there, it will become much more difficult to track down the short.


Not necessarily - an overheated wire can melt insulation inside a harness causing a short. Yes, it's USUALLY mechanical chafing that causes the problem (thankfully) - but not always.




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