MJ Comanche Tech. Stock & Modified. MJ (86-92)
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'Trans' Fuse blows whenever i turn the key over

Old 04-02-2014, 12:20 AM
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Year: 1988
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Default 'Trans' Fuse blows whenever i turn the key over

Hey..

I have an 89 MJ and the trans fuse blows everytime i put a new one in and turn the key over.. Does this mean i have a bad ground or something ? Looking for suggestions to fix this.. Where do i start ?

Also, I'm assuming this is the fuse that allows my reverse lights to work, because they never have ???

Thanks.

PS - Be prepared for follow up questions, cause this isn't my only electrical issue with this thing !
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Old 04-02-2014, 04:29 AM
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Unplug the NSS see if fuse still blows.
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Old 04-02-2014, 07:53 AM
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The Power/Comfort switch can be shorted inside causing your issue. Unplug it and then put a new fuse in and see what happens.

And if you're gonna have it out, it will most likely break.

Here's what I do on every one I work on:

Bypassing the Power/Comfort Switch on a Renix Jeep

Remove and unplug the switch. In the harness are 3 wires One has a stripe, one is tan, and the other black. Make a 4" jumper wire with a male spade at each end. Plug one end in the cavity for the tan wire and the other in the cavity for the striped wire and you'll be in permanent Power mode. Stuff the harness back in and reinstall the switch for looks.
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Old 04-02-2014, 11:00 AM
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sorry.. i should have mentioned. it's a 2.5L 2wd 4 speed manual..

pretty sure i don't have an NSS and for sure i don't have a power/comfort option.

thanks!
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Old 04-02-2014, 06:46 PM
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Originally Posted by StewMac View Post
sorry.. i should have mentioned. it's a 2.5L 2wd 4 speed manual..

pretty sure i don't have an NSS and for sure i don't have a power/comfort option.

thanks!
Nope deff no NSS. Seeing is 4 speed un plug the switch on side of tranny that power reverse lights see if it still pops. On mine that the only thing it powers I know of.....
Attached Thumbnails 'Trans' Fuse blows whenever i turn the key over-5th-gear-switch.jpg  

Last edited by freegdr; 04-02-2014 at 06:56 PM.
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