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GLozier 09-25-2011 07:37 AM

04 WJ Blowing Flasher Fuses
I'm a newbie to the site but not to Jeeps. I previously owned a 98 Cherokee Sport but I let the wife have it in the divorce. :slapfight:She wasn't getting my 99 Ram 2500 4x4!
I just picked up a few days ago a 04 GC Larado with the 4.7 and up until yesterdayafternoon I was lovin' it, not so much right now. I lost my turn signals and flashers, found a blown fuse (15 amp) so I went to replace it and as soon as blades made contact it blew. I haven't checked bulbs yet but all the parking lights are working. Could this be in the multi-function switch? All other functions work normally...headlights, parking lights, fog lights and dimmer. Any suggestions on where to look will be greatly appreciated.
Greg in Maine
04 GC Larado 4.7L

JeepMe 09-25-2011 09:19 AM

Re: 04 WJ Blowing Flasher Fuses
What fuse number are you blowing? It could be the selector switch, but that wouldn't be my first guess. My first guess would be a chafed wire somewhere.

GLozier 09-25-2011 09:42 AM

Re: 04 WJ Blowing Flasher Fuses
Thanks JeepMe. It is the 15 amp fuse for the flasher. I have done some more troubleshooting and found a dangling ground wire for the trailer hitch wiring in the passengers side rear taillight. It doesn't look like it was ever hooked but there are some chafed wires that I have put some tape on. I keep thinking that it may be in the multi-function switch as whatever it is took out the turn signals and the flashers. I also tried a new flasher and it didn't solve the problem. Fortunately I work part time for Advance Auto Parts and I can return it.

scjeep4.7HO 09-25-2011 10:06 AM

You have a short.

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GLozier 09-25-2011 10:24 AM

Re: 04 WJ Blowing Flasher Fuses
Thanks. Any ideas as to where I might want to start looking? I'm guessing that the only thing that the loose ground wire in the rear tail light would keep from working is the trailer wiring?

Frango100 09-25-2011 10:31 AM

Re: 04 WJ Blowing Flasher Fuses
When you remove the combination flasher, will the fuse be ok:confused:. If yes, disconnect the multifunction switch and try again. This will probably be the only way to finally find the short.

GLozier 09-25-2011 11:25 AM

Re: 04 WJ Blowing Flasher Fuses
Thanks Frank. I have tried the fuse without the flasher and it still blew. I'll go try the the multi-function switch. I'll be back!

GLozier 09-25-2011 11:41 AM

Re: 04 WJ Blowing Flasher Fuses
Found it Frank. It is the multi-function switch. After I disconnected the harness from it I put in a new fuse and it didn't blow. As soon as I connected it back up it blew. Going to check as much wiring on the harness as I can see to look for any breaks and if that all looks good, it's ff to shop for a new switch. Thanks for the help.

GLozier 09-25-2011 12:12 PM

Re: 04 WJ Blowing Flasher Fuses
I FIXED IT!! It wasn't the switch. I decided to do some more troubleshooting and experimenting before I jumped into spending $$ on a new switch. It would flash on the right side but if I hit the flashers it would blow. Unplugged the connection to the flasher button, right turn signal good, left it would blow. I remembered that funky mess of DIY wirng for the trailer harness on the driver's side rear so I decided to unhook it all, tape up the bare spots on the wires, put it all back together and voila, turn signals and flasher work.
Thanks all for the ideas. Now I'm happy with my GC again.

Frango100 09-25-2011 02:12 PM

Re: 04 WJ Blowing Flasher Fuses
When the fuse was still blowing without the combination flasher in place, the problem should be in between the fuse and the flasher. At least when your 15 A fuse was on position 4 on the junction block (as it should). The second fuse for the combination flasher is at position 20, but should be a 10 A fuse. But this fuse also powers the heated seats, transmission solenoid TRS assy and cabin temperature control system (manual or automatic).
Also when troubleshooting a system, you best start first with everything switched off, put the fuse in place and then one by one switching the lights, until the fuse blows.

GLozier 09-26-2011 06:41 PM

Re: 04 WJ Blowing Flasher Fuses
When I first started trying to diagnose the problem, it was blowing the fuse before i even turned anything on, as soon as fuse blades made contact with the fuse box it blew. Once I finally eliminated the DIY trailer wiring harness, the issue was resolved. Appreciate all the feedback from everyone.

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