jimlj

Does anyone have a wiring diagram for the brain box for a '89? I want to use it in my conversion, but I need to know how to wire it in. I have the one wire that really matters hooked up right now, but want to get the grid heaters and ksb hooked up and working.

wannadiesel

DB/WT - KSB solenoid
YL/BK - Grid heater 1 control power
DB - 12 volts from ignition switch run position
OR/BK - Grid heater 2 control power
YL - 12 volts from starter relay
DG/WT - WTS light
TN/BK - WIF sensor power
BK/PK - WIF light
BK - Ground
LB/BK - Air temp sensor power

jimlj

THANK YOU!!
Thats zactly what I needed to know.

I assume that the yellow only has power on it while the starter is energised?

wannadiesel

Yes. That lets the brain box know that the truck has been started so it will run the grids in "post-heat" mode.

It'll be pretty trick to have it working like the factory intended in the Ford.

jimlj

Thats the plan. I don't know if I am goning to hook up the message center yet or not. There is not a real good place to cut it into the dash. I think I will use some LED's for the WTS and WIF lights.

Thanks again!