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Unread 04-25-2008, 07:14 PM   #1
blamejane2
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1995 YJ Wrangler 
 
Join Date: Oct 2007
Location: Montana
Posts: 89
heater fuse keeps blowing

I just replaced the blown fuse for my heater. With a new fuse in place I tried the heater, and again nothing...sure enough I've blown another fuse. After installing another fuse I started the jeep and then stopped it (without turning on the heater). I checked and the fuse was blown again, just by starting the jeep.

Does anyone have an ideas where/what I should look at?

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Unread 04-25-2008, 10:50 PM   #2
coshooter
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2009 JK Wrangler 
 
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Possibly a bad switch that's got an internal short. If you use an ohm meter and test from the switch side of the fuse plug (not the side with 12v coming from the battery) to a ground on the jeep and have continuity that would indicate a short either between the fuse and the switch or in the switch itself.
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Unread 04-25-2008, 11:02 PM   #3
blamejane2
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Thanks coshooter. How do I tell which side of the fuse plug is the switch side, versus the side coming from the 12v battery)?
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Unread 04-26-2008, 06:37 PM   #4
xeroid81
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Are you putting the right amp fuse in there?
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Unread 04-26-2008, 07:16 PM   #5
blamejane2
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yes, it calls for 25 amps.
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Unread 04-26-2008, 08:58 PM   #6
coshooter
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Quote:
Originally Posted by blamejane2 View Post
Thanks coshooter. How do I tell which side of the fuse plug is the switch side, versus the side coming from the 12v battery)?

Use a test light or voltmeter and see which side of the fuse plug has 12v to a frame ground with the key in the on position.
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Unread 04-27-2008, 09:48 AM   #7
xeroid81
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It sounds like a short to the motor from the switch or the relay if it's on the load side.
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Unread 04-27-2008, 02:18 PM   #8
blamejane2
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1995 YJ Wrangler 
 
Join Date: Oct 2007
Location: Montana
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I have continutiy at the fuse when testing the switch side. I disconnected the heater switch and checked again, the fuse still has continuity. I disconnected the a/c switch and still we have continuity.

Any ideas?
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Unread 04-27-2008, 05:10 PM   #9
blamejane2
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1995 YJ Wrangler 
 
Join Date: Oct 2007
Location: Montana
Posts: 89
There's supposed to be a diode tapped in the wiring harness somewhere near the wiper switch t/o.

Does any one know where this diode is? I need to see if this diode was blown when my pcm fried. I'm trying to trace fuse #12 dk green wire, which is supposed to have a diode.

Any help would be awesome.
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