As we are taking our TT and two other trailers to CA next month I'm taking them all to a mechanic/friend to have axles serviced. Two days ago I towed the flatbed to him and all lights worked as well ...
The breakaway brake battery is only used when the breakaway switch is activated, and plays no role in braking when properly hooked to the tow vehicle.
Non-braking could be caused by a bad ground, a bad brake wire connection, bad brake adjustment, stuck brake mechanisms, bad breakaway brake switch, and probably a host of other possibilities...
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