Q.) Will the Primus™ work with Electric-Hydraulic Brakes?
A.) Tekonsha® brake controls are designed to operate electric brakes that are activated by magnets. They have not been tested for the use on electric/hydraulic brake systems. Please contact the manufacturer of the hydraulic control unit for their recommendations.
Q.) The Display only goes to "4.7" when applying brakes.
A.) The Primus™ detects an open ground. The Primus™ needs to have voltage on the Black wire and a good ground on the White wire to operate. Possible Causes:
· Gain set to 4.7 volts.
· Bad ground connection on White wire.
· Faulty control.
Q.) No "C" displayed with trailer connected or display blank with trailer connected.
A.) The Primus™ has to have a complete circuit on the Blue wire to the brake magnets and then to ground, with the proper resistance. Possible Causes:
· Open on electric brake circuit (Blue wire).
· Power backfeed on Blue wire.
· Open on ground circuit of trailer or truck.
· Trailer has electric over hydraulic brakes.
· Faulty Control.
Q.) The Displays shows "0.0" when applying brakes.
A.) The Primus™ detects a short to ground on the brake wire (Blue wire). The Primus™ has to have a complete circuit from the control to brake magnets to ground and has to have the proper resistance. Possible Causes:
· Gain set to minimum.
· Short to ground on the brake circuit wire.
· Electric over hydraulic brakes.
· Faulty control.
Q.) No braking with the brake pedal activated, but "OK" with the manual lever.
A.) Possible Causes:
· Control not leveled properly.
· No power on Red wire at back of control.
· Faulty control.
Q.) I can not level the control.
A.) Possible Causes:
· No trailer connected.
· No power on Black wire.
· Bad ground on White wire.
· No power on Red wire with brake pedal depressed.
· Open in brake circuit wire.
· Control mounted out of range.
· Truck and trailer mis-wired.
· Faulty control.
Q.) If you need further assistance or are experiencing a concern not listed here.
A.) Please call Tech Support at 888-785-5832 or Go to the Contact Us Link on this website.
