Electric Trailer Brake Question
I am new to RVs and recently took possession of a new Montana 3790RD fifth wheel RV. The 3790RD is rated at 13K pounds dry and the CAT scales gave me a trailer axle weight of just under 11,000 pounds....
Forum Discussion
Has the OP been able to resolve his braking issue yet?
I ask because I have pretty much the same setup, same issue. 2015 Ram 3500 with bighorn 5er, dexter 7k axles with 12x2 inch neveradjust brakes. Just drug the 5er back from the dealer where they did a good checkout on the brakes, 12.3 amp current draw, pulled two drums checked for contamination etc. and they looked good. When I came to pick it up they came out and we agreed the brakes weren't working good on my rig. Ran a cord out the window, went up to 20mph and pulled the breakaway cable and brakes worked real good. Just can't get anything like that sort of braking in normal operation with the 5er really pushing the truck hard during braking.
The truck is scheduled with the dealer for Monday. I'm getting an intermittent brake light inop signal indication on the EVIC when using the truck as my commuter for the snowstorms we've been having, and twice I've got a message to service the air suspension. They both clear themselves.
The checks I've made are brake signal voltage, which only measured 7.4 volts to the brakes when I tested with a voltmeter, truck set to heavy electric, gain maxed at 10. I'm going to make up a harness to hook to the bumper pull plug while my 5er is connected to the bed connector and run the wire through the back window into the cab so I can hook up a scope and see what sort of duty cycle I'm getting pulse wise out of the brake controller while actually in use. (it needs a trailer connected to work) The pulse duration must be pretty low for my multimeter to be only averaging it out to 7.4 volts, but I'll be able to know for sure when I measure it.
It would be interesting to know if others with a similar setup are having issues.
I ask because I have pretty much the same setup, same issue. 2015 Ram 3500 with bighorn 5er, dexter 7k axles with 12x2 inch neveradjust brakes. Just drug the 5er back from the dealer where they did a good checkout on the brakes, 12.3 amp current draw, pulled two drums checked for contamination etc. and they looked good. When I came to pick it up they came out and we agreed the brakes weren't working good on my rig. Ran a cord out the window, went up to 20mph and pulled the breakaway cable and brakes worked real good. Just can't get anything like that sort of braking in normal operation with the 5er really pushing the truck hard during braking.
The truck is scheduled with the dealer for Monday. I'm getting an intermittent brake light inop signal indication on the EVIC when using the truck as my commuter for the snowstorms we've been having, and twice I've got a message to service the air suspension. They both clear themselves.
The checks I've made are brake signal voltage, which only measured 7.4 volts to the brakes when I tested with a voltmeter, truck set to heavy electric, gain maxed at 10. I'm going to make up a harness to hook to the bumper pull plug while my 5er is connected to the bed connector and run the wire through the back window into the cab so I can hook up a scope and see what sort of duty cycle I'm getting pulse wise out of the brake controller while actually in use. (it needs a trailer connected to work) The pulse duration must be pretty low for my multimeter to be only averaging it out to 7.4 volts, but I'll be able to know for sure when I measure it.
It would be interesting to know if others with a similar setup are having issues.
