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Old 10-02-2012, 04:23 PM   #1
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Unhappy Hubby made a battery booboo!

My husband got me a new battery for tow-truck aka 2004 Mercury Mountaineer and now my brake controller does not light up/work at all. Any ideas? He is hopeless at all things mechanical/electrical but will take any suggestion and try his best.
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Old 10-02-2012, 04:49 PM   #2
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I bet the power wire to your controller was hot wired to the battery. Look for a lose wire near the battery?
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Old 10-02-2012, 04:51 PM   #3
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Hubby made a battery booboo!

Greetings Landmammal!

Quote:
Originally Posted by Landmammal View Post
My husband got me a new battery for tow-truck aka 2004 Mercury Mountaineer and now my brake controller does not light up/work at all. Any ideas? He is hopeless at all things mechanical/electrical but will take any suggestion and try his best.
I suspect that there could be one of several causes for the brake controller ceasing to function after replacing the tow vehicle's battery:
  • On my 1977 Cadillac, the positive wire for the brake controller is inserted into the positive cable clamp on the battery . . . if this connection is not tight and clean, the brake controller can prove problematic.
  • If the battery cables were reversed momentarily, or if the ground was connected before the positive cable, a power surge may have either tripped a circuit breaker/fuse or killed the brake controller's circuit board.
  • Was your trailer connected when testing the brake controller following the new tow vehicle battery installation? With some brake controllers, the pilot light only illuminates when the trailer is connected to the circuit (that is true of my Voyager controller, but the pilot light is on whenever the ignition switch is in the "on" position with my Hayes-Lemmerz brake controller).
  • With the blade type trailer wiring connector, corossion can become problematic. I ofthen either had problems with the brake and/or charge line connections requiring cleaning the terminals and connectors on both tow vehicle and trailer ends. To end this constant issue with corossion, I switched to heavy-duty round-pin connectors ustilized by the over-the-road trucking industry . . . these are said to be self-cleaning each time the devices are connected/disconnected.
Good luck with your investigation!

Kevin
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Old 10-02-2012, 06:24 PM   #4
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Probably, whoever installed the battery failed to reconnect a wire to the positive + post that was the power source for the controller.
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Old 10-02-2012, 06:28 PM   #5
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Some controllers are very particular about the order in which the wires are hooked up. Some require a specific sequence of power hookup, or they get confused. Get you installation manual out and see if there is verbiage to that effect.
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