[biketopia]

Also look for added wires and modules. Looks like it has/had a remote start installed and depending on how it was wired and operates it could be giving you problems. What makes you think the ABS module is bad by looking at it from under the truck? On those years typically the relay board on top of the valve body fails internally. You can buy a replacement from Dorman I believe and just swap it on without un-doing any of the brake lines. You'll definitely want to keep the ABS block functional on the truck.