Center dash electrical gremlins - Defender Source
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  #1  
Old December 6th, 2009, 06:21 PM
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kevin
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Center dash electrical gremlins

I am pulling my hair out in attempt to find out why when I hook up a clock, volt meter gauge or anything else for that matter it works fine until I turn the headlights on? I am using the wiring that comes up at the center of the dash above the fuse panel, not the instrument binnacle. Does not matter if I choose a positive lead that is live all the time or only when the ignition is on such at with the volt meter. There are a ton of wires to choose from but it all turns out the same, loss of power when the headlights turn on. What gives?
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  #2  
Old December 6th, 2009, 06:23 PM
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steve
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Full loss of power or just a reduction in volts?
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Old December 6th, 2009, 06:34 PM
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Quote:
Originally Posted by D90user
Full loss of power or just a reduction in volts?
Full loss, test light turns off, when headlight turns on. Volt meter is reading 13.5 when truck is running with headlights on, it just seems to be the wiring in the center console area where the 12 accessory plug or cigar lighter are.
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  #4  
Old December 6th, 2009, 06:44 PM
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steve
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Wierd. Only thing to do is to trace it back.

Long ago I started my own accessory fuse panel, you may want to do this also. It really makes life simpler.

sorry I dont have better advise.
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Old December 6th, 2009, 07:48 PM
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has someone wired in a relay to power over wattage bulbs?

My guess and it's only a guess that the lights being off provide an earth route for all the accessory lines and when it powers up it changes the earth path.

did it ever work? did it just start to fail? what did you do between working and fail?
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Old December 7th, 2009, 07:53 PM
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What kind of shape is the light switch in? They do start to melt internally sometimes, and that causes all sorts of oddball problems as all the connectors move around in the goo of melting/solidifying plastic.

-Hans
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Old December 8th, 2009, 01:37 AM
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Quote:
Originally Posted by Hans
What kind of shape is the light switch in? They do start to melt internally sometimes, and that causes all sorts of oddball problems as all the connectors move around in the goo of melting/solidifying plastic.

-Hans
Hans,

That might be it, other switches such as the highbeam switch has started giving problems. I think it's time to just replace all the steering column switches.
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