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SUBJECT: # 13534: Blown Relay switch on a Chevy Trailblazer help!

Submitted by bassmajic ( from NORTH DAKOTA on 5/17/2011 11:53:00 AM

Plugged in my Ranger "02" trailer to my girlfriends Chevy Trailblazer and it blew the Relay Switch. I just tested it two weeks ago in the garage on my Ford truck and everything worked fine. I have never had any issue's plugging in into my Ford Truck since 02".
She just bought the "08" Blazer one month ago and we thought we would us her Blazer this trip. Her local garage guy said it may have blown the relay because not being used for some period of time.
Got any idea?

  1. 5/17/2011 12:03:00 PM Submitted by MikeF from FL says it's probably a fuse
    They have separate fuses for the trailer lights. It's in the owner's manual.

  2. 5/17/2011 2:26:00 PM Submitted by rgray200 #13648 from OH says Thanks Mike, but why would?
    It blow her relay out just by me plugging in my trailer lights to her blazer. Her mechanic said it could have been caused from her blazer plug not being used for some time. Is that possible?

  3. 5/17/2011 3:28:00 PM Submitted by MikeF from FL says it shouldn't
    There's no reason the relay would have blown out from plugging in the trailer. The relay contacts will handle way more current than the fuses. Either it was already bad or you really didn't need (or maybe get) one.

  4. 5/31/2011 9:53:00 PM Submitted by SurFishaLot #12110 from NC says My F250 relay contacts couldn't handle...
    more than the fuse. I had an intermittent short in my trailer lighting. I never over-fused it, and I ended up burning up the relay contacts. (I only burned about three fuses before the relay was toast.)

    Once the short became continuous, it was easy to find / correct, but the damage was done.

    But... the relay in a 2002 F-250 is not replaceable. I had to bypass the circuit and steal power from another circuit... OR replace the entire junction box in the truck. I didn't even ask FoMoCo how much that would cost.

    My solution cost about $10 in parts and about 3 hours of my time.

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