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rear defrost question


JWX
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ok, I think I have a bad ground or something in my hatch. when I turn on my rear defrost the volt gauge goes down slowly and stops at about 12-13 volts and no amount of reving will bring it back up. thats only with that and the radio and the engine runing, if I have the the headlights and stuff on like this mourning the volts ran about 12 or so all the way to work and when I got there I turned off the rear defrost and it came back up. and the bottom three or four and about two lines down for the top don't work, but the rest do I checked the grid with a test light and there getting power but not doing anything. what should I look for?

(and yes for those wondering I have been driving it a lot lately)

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The defroster sucks a LOT of power (even with a few rows missing). It sounds normal -- that when you turn it off, the battery voltage goes up.

 

You probably have a weak electrical system, it should hit 13+ volts when you rev it. I'll let someone else help with that, I don't know 'nough 'bout sick alternators or voltage regulators.....

 

Defroster lines (the rows on the rear window) are easy to scratch, and that's what kills a line. A scratch can be all but invisible. I can't imagine anything else causing a few of the lines to drop out. Clean the window (c-a-r-e-f-u-l-l-y) and inspect them with a magnifying glass. Parts stores have a dab-on fixer, that completes the electrical circuit. Some other thread here today mentioned that fix.

 

-- Mark

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