Electrical frustration..., This is starting to piss me off. |
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Electrical frustration..., This is starting to piss me off. |
BMartin914 |
Nov 11 2004, 09:21 PM
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#1
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||| Group: Members Posts: 1,408 Joined: 30-May 04 From: Oregon Member No.: 2,128 Region Association: Pacific Northwest |
So I have a recurring electrical problem in which my front marker lights, rear marker lights and rear tail light do not work.
I have traced down the wiring, see no problems. Cut open the harness and inspected as much as I can see (which is most of it) and still see NO problems (melting, arcing, etc.). Tonight I cleaned ALL the grounds (under relay tray, trans strap, fuse box, etc.). I then pulled all of the affected bulbs and planned to put them back in 1 by 1 until the fuse blew. Didn't get that far. As soon as I pulled the switch out the fuse blew. This leads me to believe that wires are arcing somewhere, but as indicated, I see no visible melting or arcing. Does anyone have any ideas? I am at the point where I am willing to re-wire the circuit to fix the problem. Anyone have any ideas before I re-wire this b**ch? Thanks. |
Spoke |
Nov 12 2004, 09:50 AM
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#2
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Jerry Group: Members Posts: 6,996 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None |
Sorry I didn't realize that you had a short that was blowing fuses.
The 2 wires on the 5th fuse go to the front and back markers respectively. With the battery disconnected, try removing one wire at a time and measure the resistance from the wire to ground. With the bulbs installed, it should read about 3-15 ohms. If you show a dead short (0 ohms), then there's a wiring short on that leg. My guess is that it's one wire, either in the front or the rear. If you're not sure which wire is the front or the back, remove all bulbs on the front or the back to see which wire shows the change in resistance. Also try removing the all bulbs from the front and the back and measuring the resistance to ground. With all bulbs removed from both wires should read infinite resistance or no deflection of the meter. If you get a low resistance measurement, it means that you have a wire short somewhere on that leg. Again, I think it would be only one wire, either in the front or the back. and I would guess it may be near one of the bulb holders. Once you've located the wire (either front or back), connect the ohm meter so you don't have to hold it and try jiggling the wire at one connector at a time to see if you can find a place where the short is by watching to see if the needle moves when you disturb the area. The short is somewhere, so be patient and check things one at a time. Spoke |
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