I have a problem with my 1995 Chevy Blazer electrical system. I am blowing
fuses for the running lamps. This of course takes out the front running
lights as well as the rear lights. The turn signals and brake lights still
work fine though. I have done continuity checks of the front and back
lights, the instrument cluster lights, the trailer light assembly and every
other thing that I could think of and they all seem to make sense. Switch
works fine; as does the dimmer switch. Does anyone have any ideas as to
where I should go next? Thank you in advance for you response.
On Sat, 11 Sep 2004 14:00:03 -0400, "Brian Cunningham"
You don't want to check for continuity, you want to check for a short.
Look for bare or chafed wires in the running lights circuit. Also
check the trailer harness. Electrical problems can be VERY hard to
I'm assuming this is an intermittent problem? Here is about the only easy
way to find it. First, get a wiring diagram. Our local library has then so I
assume yours does too. Then divide the circuit into branches. Sounds hard,
but it's not. You may be lucky and find the factory splice, or you may have
to isolate them as best you can. Then install inline fuses in the separate
branches and see what blows. I find most shorts in wiring someone added, not
what the factory put in. Make sure you use small fuses in the inline
holders, like 3 or 5 Amp. I've done electrical work for years and
"intermittents" are never fun.
If it instantly blows the fuse, it's a lot easier to find.
Let me know if I can help.
I have seen corrosion on the inside of trailer hitch socket(on your truck
side) cause very similar problem to what you describe. The only other thing
I can think of is aftermarket item (CD changer etc) where mounting screw
grazed a wiring harness. > I find most shorts in wiring someone added, not
what the factory put in < 99% of time, very true.....Rico
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