Question about 2007 GMC Envoy Denali

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I just got a prodigy brake controler for trailers,we can't get it to work thru the veh wiring box,help.

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Best bet is to contact Prodogy. There should be a 1-800 number in the paperwork. They can walk you through it.

Posted on Oct 01, 2009

  • Mike Tillman
    Mike Tillman Jan 29, 2010

    Try . or call their tech number on your instruction sheet.

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I have a 2006 Chevy Silverado 1500 Extended Cab 4x4. My question is that when the truck is parked & not running with no keys in the ignition , my brake lights will begin to flash on & off until it drains...


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The STOP LP 25-amp fuse in the underhood fuse block supplies battery positive voltage to the normally open stop lamp switch. When the driver presses the brake pedal, the switch contacts close and battery positive voltage is supplied to both the STOP 15-amp fuse and the center high mounted stop lamp (CHMSL) 10-amp fuse in the instrument panel (I/P) fuse block, and to the turn signal/hazard module. The turn signal/hazard module then supplies voltage to both of the trailer rear turn/stop lamp supply voltage circuits. The voltage from the CHMSL 10-amp fuse is to the CHMSL and the trailer jumper harness. The voltage from the STOP 15-amp fuse is to the stop lamps, throttle actuator control (TAC) module, and the cruise control.

I think The turn signal/hazard module has something to do with the lights flashing .From looking at a wiring diagram B+ voltage from the STOP LP fuse 25amp in the under hood fuse box supply's the brake light switch , from there it feeds B+ to VEH STOP fuse 15amp and VEH CHMSL fuse 10amp an to stop lamp switch signal to the turn signal flasher module which is suppose to control the trailer stop lights . Do you have a connection for a trailer hook up ?
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If this has helped you, great, and please remember to vote/comment.
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