Forum Discussion
Old-Biscuit
Jul 08, 2019Explorer III
Very possible the issue is with the brake controller....
When the 'pin' was out of the Emergency Brake Switch the trailer battery would energize the 'brake circuit' (trailer AND TRUCK brake wire) with full battery voltage
Unplug truck/trailer umbilical cord
Using a voltmeter test 'brake' power to ground on truck 7 pin receptacle while someone operates brake controller manual lever to full on
IIRC should be pin 1 (ground) & pin 2 (brake).....7 o'clock/pin 1 & 5 o'clock/pin 2
When the 'pin' was out of the Emergency Brake Switch the trailer battery would energize the 'brake circuit' (trailer AND TRUCK brake wire) with full battery voltage
Unplug truck/trailer umbilical cord
Using a voltmeter test 'brake' power to ground on truck 7 pin receptacle while someone operates brake controller manual lever to full on
IIRC should be pin 1 (ground) & pin 2 (brake).....7 o'clock/pin 1 & 5 o'clock/pin 2
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