2003,Wrangler

[Peterothman]

Horn stared blasting by itself. Then check engine light went on and is still on. When you blow horn rpm’s decrease. Grounding issue?

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[AFD]

That's weird. Sounds like either the battery is crapping out and/or the alternator isn't keeping up. Most part shops like Advance Auto and AutoZone have a tester and can check the battery and alternator condition for you (for free, iirc). If it's neither of those two, then yeah, it could be a wiring/grounding issue, which isn't too fun to figure out. Best of luck!

 

[Dan M.]

Do RPMs drop when you turn headlights on? Does it drop even more with headlights and horn? If so 99% chance it is battery or alternator like AFD said. For your sake I hope it isn't a grounding issue.

 

[Old Dogger]

Welcome to the Forum, from Cave Creek AZ.
I agree with the above….

 

[desmo2]

Horn stared blasting by itself. Then check engine light went on and is still on. When you blow horn rpm’s decrease. Grounding issue?

I bet there is a TJ forum that may net you A LOT more responses. Although many of us JL owners have owned/may still own TJ's (and I wish I did), the majority of members here probably have not owned a TJ, much less troubleshot them.

 

[Shibadog]

I bet there is a TJ forum that may net you A LOT more responses. Although many of us JL owners have owned/may still own TJ's (and I wish I did), the majority of members here probably have not owned a TJ, much less troubleshot them.

This. There are a number of folks who still run TJ’s and could be more helpful than we can. Sounds like a short to me, but I’ve not messed with a TJ in a LONG time..

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