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Old 04-17-2013, 02:59 PM   #1
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fuse keeps blowing please help

1997 Wrangler 2.5 manual transmission

Was on my way to work which is a 20 mile drive. About 2miles from work engine died. Speedometer went to 0 even though I was still moving. I found fuse#11 blown PDC Coils???
Put another fuse in turned key to try it and it popped immediately. Only fuse I had left was a 20amp. I know it wasn't smart but I had to get to work. Where should I even start to look for the problem. Please help
Thanks

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Old 04-17-2013, 04:22 PM   #2
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Quote:
Originally Posted by jd37055 View Post
Where should I even start to look for the problem.
I'd start with the owner's manual. Go to the fuse chart and find out which circuits are covered by that fuse. After that, you need to check each one of these circuits for a short. Unplug them one at a time, then install a new fuse, turn the key and see if it still blows. (Alternately, you can unplug them all at once, turn the key to verify the fuse doesn't blow, then reconnect them one circuit at a time until the fuse blows.) Once you have narrowed it down to one specific circuit which is blowing the fuse, you'll need to inspect that circuit to find out where the short is.

This isn't terribly difficult, but it may take some time to properly diagnose. Hang in there and be patient.

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Old 04-17-2013, 04:33 PM   #3
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Additional information:

I once owned a Taurus which began blowing fuse #5. I was alerted to the problem because my turn signals (one of the circuits protected by fuse #5) stopped working. The turn signals were an innocent victim; the fuse was blowing because one of the other circuits protected by that fuse was shorting out somewhere. Here in a nutshell was my story on how we figured out the real problem:

Quote:
Later in the evening, one of the techs helps me look up a wiring schematic for the car. We find everything that is controlled by fuse #5. We test for--and find--key ON power at one of the fuse terminals. We then test the other fuse terminal and find out that it is grounding at all times. Okay, now we're making progress. After unplugging individual circuits one at a time and checking for any loss of grounding, we discover the true problem: the V6 rear bank's oxygen sensor wire has fallen onto the exhaust manifold itself, the protective sheath has melted away, and the sensor's heater power wire is now in contact with the heater ground wire. When we unplug the oxygen sensor, the grounding problem goes away and (once we insert another fuse into cavity #5) my turn signals actually work.
Hope this helps.
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My fleet: 91 Miata, 98 Wrangler Sport, 06 Mustang GT, 01 Suburban 8.1L, 14 Forte EX
Jeep mods: 4" longarm + 1" BL, 35" KM2s, 4.56s with dual ARBs... and lots of scratched armor
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