trailer brakes stuck on- dodge 3500
Yes, I know, the most likely culprit is the controller. But this is a new-to-me 2003 Dodge 3500. When i got it the trailer brake wire harness was still in the wrapper. I installed everything accordi...
Forum Discussion
hertfordnc wrote:
I am supposed to be getting that input from the the harness supplied by Dodge.
The other three wires in the harness do what they are supposed to;
- 12 VDC
- ground
- power to the trailer brakes.
But the wire that would serve the same function as tapping into the brake light has no voltage.
So "12 VDC" above is Black from Battery +12V,
"Ground" is White "-" from Battery,
And "Power to the trailer brakes is Blue from Controller to Trailer Connector...?
and "the wire that would serve the same function as tapping into the brake light" is the Question at Hand, and it's NOT connected to the Brake Switch as shown above...?
You say "Dodge specific." Is this Dodge new enough to be CAN/BUS with a Powertrain Control Module (PCM) and/or/maybe a Body Control Module (BCM)? I wonder if the Brake Switch tells a "Brake Light Control Module" to send a signal down the Data Bus to notify the Central Processing Unit that it's OK to tell the Output Chip to let the Brake Light Relay put the Lights on...
Could be. Our 2009 Nissan Pickup has a switch on the floorboard to keep me from cranking the starter if I don't have the clutch pushed down. OK...Switch interrupts power from Ignition Switch to Starter Relay. NO NO NO!!! The CPU is looking for a signal from that switch to come down the bus and then it directs power to the Relay. Luckily for me, a little rubber bumper had broken so the switch wasn't being pushed. I could have taped a penny over the hole the bumper left in the clutch arm. But I went high-tech and put a 1/4" capscrew through the hole with nut and lock washer.
If it's all computerized, Good Luck. Either figure it out, or I suppose you could tap into the brake lamp wiring and run THAT voltage back to the Controller Red Wire. That SHOULD work if you have separate Amber Turn Signals. If the Stop Lights are Red and they Blink as Turn Signals, really odd things are going to happen if you signal while braking.
We have enough people pulling Fivers and TT's with Dodges, somebody ought to be able to help...
