1990 FLHS wiring issue
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Cruiser
Joined: Jul 2005
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1990 FLHS wiring issue
When I apply the brake (front or rear) my volt and oil pressure gauges peg. Brake light/tail light works. Doesn't seem to be any dimming of the others lights. Plug seems to be okay. Have traced the gauge wires they seem to be okay. Don't know what colors the brake wires are. Attempted to follow the wiring diagram but can't seem to find the brake wiring.
I'm sure its a simple short just don't know how to find it.
Roach
I'm sure its a simple short just don't know how to find it.
Roach
Last edited by roach; Feb 4, 2016 at 01:20 PM.
Seasoned HDF Member
Joined: Aug 2007
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From: NW AR
When you say "peg", what exactly do you mean? Do they drop to 0 or peg to 18V?
The Orange wire drives both the volt gauge and most everything else in the faring. A dirty connection will cause problems like the volt gauge (and everything else) dropping considerably voltage when under load. And don't forget the air anti-dive valve. That is run off the brake light circuit.
The Orange wire drives both the volt gauge and most everything else in the faring. A dirty connection will cause problems like the volt gauge (and everything else) dropping considerably voltage when under load. And don't forget the air anti-dive valve. That is run off the brake light circuit.
Club Member
Joined: Jun 2007
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From: Bedford UK
An FLHS doesn't have a voltmeter or oil pressure gauge! So they have probably been added at some time. I would check them and their wiring before looking any closer. Do you have the factory service manual, or an aftermarket one?
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Cruiser
Joined: Jul 2005
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Thanks Doc H. The volt meter and Oil pressure gauge drop to "0".
GR you are correct sir, the FLHS does not have those gauges. I added a fairing with the gauges in it several years ago. Yes I do have a factory service manual. I have attempted to use the
wiring diagram to trace the wiring from the brake switch to a common plug that would affect the gauges.
Roach
GR you are correct sir, the FLHS does not have those gauges. I added a fairing with the gauges in it several years ago. Yes I do have a factory service manual. I have attempted to use the
wiring diagram to trace the wiring from the brake switch to a common plug that would affect the gauges.
Roach
Club Member
Joined: Jun 2007
Posts: 45,429
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From: Bedford UK
That suggests they are losing power, perhaps a poor contact or ground. Many years ago I chased an occasional problem on a BMW and eventually found it, thanks to a friend wh knows his electrics better than I do. We found a loose connector which only failed to conduct when pulled in a certain way. Could be you have to hunt down something like that. Old electrics can be devious things to sort out!
Thread Starter
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Cruiser
Joined: Jul 2005
Posts: 149
Likes: 11
Thanks for the help grb.
I hate wiring ghost. I know just enough to get in over my head. I will continue the search.
Roach
I hate wiring ghost. I know just enough to get in over my head. I will continue the search.
Roach
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