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Unread 02-17-2013, 09:08 PM   #1
Lgleason
Registered User
1990 YJ Wrangler 
 
Join Date: Jan 2010
Location: Sonora
Posts: 54
Fried wire

I posted a few days ago about this electrical problem and fusible links on my 1990 YJ. Well they all check out good, removed and relocated the starter relay and cleaned all contacts. Suspected the starter switch as all else seems to be good. Wow, what a bugger to get to, we pulled the steering column and was able to get to the switch. Removed it and replaced it with the key in the off lock position. There is a yellow wire coming off the switch that had the insulation melted on it. Taped it up and decided to try and start the Jeep. Left the column out to easy access if needed. Put battery back in and when I hooked up the negative cable the wiring loom across the firewall began to smoke. Couldn't disconnect the battery fast enough. Bared the wiring harness and find the yellow wire to the fuse block is fried. It comes off the block and goes across the firewall to about center then joins I think three others and also forks into the firewall. I believe the other end goes to the ignition switch. Cannot figure out why no fuses or fusible link blew. So, any ideas why and also what this wire might serve?

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Unread 02-18-2013, 05:11 AM   #2
90DesertTanYJ
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1990 YJ Wrangler 
 
Join Date: Jun 2012
Location: Jacksonville, FL
Posts: 735
The yellow wires in your harness generally serve as ignition hots and they will run to different things on your YJ. They go to the ECU, the ICM, ignition switch, others. You are gonna have to trace it and test the components to see which one is shorting out.
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Unread 02-18-2013, 06:59 AM   #3
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 13,721
Yellow is your lights. The wire fried so you have a dead short. You need to use a fsm wiring diagram and a bulb and find out where the short is. Here is a link to the youtube video explaining the light bulb trick to find a short and the fsm.
https://www.youtube.com/watch?v=HQzjGtXJY_k

Here is a link for the FSM. .
http://dl.dropbox.com/u/40590346/87-88%20YJ%20Jeep%20Wrangler%20FSM%20manual.pdf
http://dl.dropbox.com/u/40590346/1990%20Jeep%20Factory%20Service%20Manual.pdf
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Unread 02-18-2013, 08:05 AM   #4
Lgleason
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1990 YJ Wrangler 
 
Join Date: Jan 2010
Location: Sonora
Posts: 54
Thanks, I'll give it a try today. What I don't understand tho is why the fuse or fusible link did not blow. Any ideas on that?
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Unread 02-18-2013, 08:34 AM   #5
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 13,721
Common issue with lights Usually backfeed issues. Have you been having taillight issues?
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Unread 02-18-2013, 08:41 AM   #6
Lgleason
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1990 YJ Wrangler 
 
Join Date: Jan 2010
Location: Sonora
Posts: 54
Not with the tail lights but just before this happened the right turn indicator on the dash started to stay on all the time and the turn signal (right front) burned out the bulb. No other light issues I am aware of.
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Unread 02-18-2013, 08:54 AM   #7
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 13,721
Turn signal circuit is probably where to start looking. The bulb trick saves you a lot of fuses.
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Unread 02-18-2013, 08:56 AM   #8
Lgleason
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1990 YJ Wrangler 
 
Join Date: Jan 2010
Location: Sonora
Posts: 54
Thanks for the info. I'll start there and let you know what I find. Again, thank you.
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