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Unread 07-22-2013, 05:14 PM   #1
Joemon11
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1999 TJ Wrangler 
 
Join Date: Sep 2012
Location: Tampa, Florida
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Fuse blows when put into reverse

99 Wrangler 2.5 manual. Wouldn't start, would crank, but not turn over. Replaced fuse # 20 in the PDC under the hood, as it was blown. This fixed the problem, Jeep turned over fine. BUT... when I put in reverse and clutch engaged then it died and the same fuse was blown again. Replaced the fuse and started fine, had no problems engaging clutch in all the forward gears. Why did the fuse blow when put into reverse, where do I start? Any and all help is appreciated.

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Unread 07-22-2013, 05:46 PM   #2
KaiserJeep
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2003 TJ Wrangler 
 
Join Date: Jun 2003
Location: San Jose, CA
Posts: 1,640
There is an electrical short to ground in the backup lights. It is probably near the lights but could be anywhere between the fuse and the lights. There is a backup switch in the transmission that activates the lights.
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1967 Kaiser Commando
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2003 Wrangler Rubicon TJ
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Unread 07-22-2013, 06:25 PM   #3
Knuckelhead
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Quote:
Originally Posted by Joemon11 View Post
Replaced fuse # 20 in the PDC under the hood, as it was blown.
Quote:
Originally Posted by KaiserJeep View Post
There is an electrical short to ground in the backup lights.
Aren't the backup lights powered off the Fuse Block and not the PDC?...
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Unread 07-23-2013, 06:34 AM   #4
steveinmedford
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2014 KL Cherokee 
 
Join Date: Aug 2002
Location: Medford, Mass
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Check the bulb sockets. One of mine fried and melted the base. Is it wet under the lens?
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Unread 07-23-2013, 06:41 AM   #5
BYuen
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2001 TJ Wrangler 
 
Join Date: Jun 2007
Location: , Arkansas
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X2 on the bulb sockets. Happened to mine before and has to replace it.
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Unread 07-23-2013, 11:48 AM   #6
Jonny Jeep
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1997 TJ Wrangler 
 
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Fuse 20 is the IOD fuse. It supplies power to the courtesy and under hood lamps, radio and cluster memory and the OBDII connector under the dash. It has nothing to do with either the reverse lamps or the running of the Jeep.

There may be a chafed or trapped wiring harness somewhere that is grounding out to the body/chassis or to other circuits, or an over heated section of loom where the conductors are touching. On it's own there's no way that fuse will stop the engine starting or running.
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