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Re: clock fuse keeps blowing Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Tue, 6 Jul 2004 09:36:15
In Reply to: clock fuse keeps blowing, jw, Tue, 6 Jul 2004 08:27:50 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The fuse is there to protect the wiring. It's probably a 10 amp fuse, which is a lot of current. You've probably got a short in there somewhere. I'm assuming the interior light doesn't work.
Step 1 -isolate everything. Pop the radio out. Pull the cover off the interior light(s) and pop out the bulbs. Look for obvious things, like broken fixtures, burn marks, that sort of thing. If you can pop the clock out, disconnect that, too.
Pull the fuse out, and get yourself a voltmeter. Measure the voltage on each side of where the fuse went in (with negative lead on chassis ground). the side with 12 volts is the source; the side with 0 volts is the load. Now, switch the meter to ohms, and measure the LOAD side. I'll bet it's only a few ohms. When you find the short, that'll jump up to many ohms - with no lights or radio, probably many thousands of ohms. By using the meter to know, you don't have to keep throwing fuses in.
Now, the fun part. Find the short. Shorts usually happen where wires are pinched, or where things connect. Where things connect, they also disconnect. So I'd start with the interior lights. Pull the fixtures apart, and see if the hot side of any fixture has loosened up and found a way to touch the chassis. Of course, if pulling the radio out fixed the problem, then it could be the radio. Bulbs rarely fail shorted, but it does happen. If pulling a bulb fixes the problem, well, replace the bulb. They're cheap. A typical interior bulb is around 5 watts- thats around 25-30 ohms. If you find one that reads 1 ohm, toss it.
posted by 192.249....
, Tue, 6 Jul 2004 09:36:15 <-- Viewing This Message
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