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I have a 2002 Chevy Express van that is wired for 7 prong trailer brakes. I started to replace the 7 prong plug and now I can't get the brake lights to shut off. I have read something about resetting a CHMSL relay needing to be reset. Does this make sense? I have don't nothing to the existing wiring of the van just trying to replace this 7 prong plug.
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One of the vehicles would also need to be fitted with a electric brake controller. If the Tundra already has one fitted then the answer would have a 99% chance of yes.
if there is a power problem then the corresponding lights of the vehicle will out as well. If they work check where the harness is plugged in and check the connection.
If you're only blowing the fuse while the trailer is plugged in, the problem is in the trailer/wiring. This takes into account that the truck has a factory installed 7 way receptacle. If that's not the case, the problem can be in the incorrectly wired truck and the trailer is ok.
On the truck, looking into the 7 way receptacle should be as follows. Top left=Tail Lights Top right=12v steady source/charge line Left middle=Left turn/brake Right middle=Right turn/brake Left bottom=ground Right bottom=brake controller output Center=reverse lights if your trailer is equipped.
Check for power at the splice/connector. Also check fuses as it should have different fuses for trailer lighting. Also Try this site http://www.etrailer.com/faq-wiring.aspx. Full of useful info.
owners Manuel? call dealer ? or if you do all your own repairs pick up the repair guide? on my blazer most of the wires were the same color as the connector as i was using but that was on a 7 wire system voltage tester and a buddy works quickly too White should be ground, blue electric brakes, red constant power other then that things get a bit fuzzy but keep checking
the wire you maybe talking about could posibly be for the trailer brake controller, which you have to buy serperate i'm not to sure how much it will run you but i would look into that because that is what the extra wire is usually forwith the 7 prong trailer plugs
there are kits available at auto parts stores that plug into existing brake lights. Some kits have modules that are necessary for proper signal to trailer lights.
Ask dealer if it has a towing package on it. If it does, you usually just pop fuse in under hood for electric brakes, and harness to adapt into is usually near or at rear bumper. Even if it doesn't have brake wire, you should still be able to install adapter at rear,for lights etc. which is available from dealer or auto supply places, then you may have to run electric brakes separate.
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