Electric Brake Issue

trailer brakes are fine mechanically and adjusted carefully, I just did it. plenty of pad material left, free movement of all parts, freshly lubed with brake lube on the arms and shoe/backingplate contact areas.

we still have the old trailer, brakes are fine on it(full lockup using the manual push button.

so it pretty well comes down to electrical on the new trailer(12 yr old)

i'll check the resistance between the brake pin on the plug and ground

i'll jack it up one side at a time and pull the breakaway switch

edit: I have 1.5 ohms between the brake contact and ground at the trailer plug. sounds about right for 4 coils in parallel

we took the trailer/truck for a short drive last night, very little braking action using the manual override button

with a voltmeter across the trailer battery, I read 12.4 volts then 12.2 with the breakaway pin pulled, so the brakes are "pulling" current from the battery

I also jacked up one side, pulled the breakaway pin and both wheels are locked solid

btw, it took a major effort to pull the breakaway pin, it should be pulled and lubed once in a while, much easier to pull out now!!