So I’ve had a 12HT in my 60 for a bit. Living in Texas I did not figure I’d need the glow screen. Spent 2 weeks in CO and WY last summer and the truck was a bit disturbed on the sub 35 degree starts. Was in the back of my mind to rig up the system but quite frankly had zero understanding of how it worked. Consulted a bit with a buddy
@ceylonfj40nut and then stumbled across this thread and believe I figured out for myself how to do this. I’m actually getting a HJ60 going for a friend
@LowDown that had a 12HT transplanted. Truck still has the hj60 harness so I went with one relay and tied it to the red side which I believe gives it an immediate kick. Wired in a momentary switch so it can be held as Long as needed and two...it won’t accidentally be left on. Used the 60 harness and clipped the ground and positive wires that lead into the relay (not the heavy gauge wires bolted to the posts). Then extended the ground to the fire wall and the positive to the dash where it plugs into the momentary switch. The other side of the switch is direct to the battery. This is a 24v system so I looped the switch to the negative terminal on the RHS battery (12v). Relay still fires and sends the voltage to the glow screen. I tested it this way since my personal truck is 12v. Wanted to see if the relay actually works and it does. Question for y’all...do I leave it on the negative post or move it to the positive/24v post? Thanks. Jim