Amateur driver on public roadway, do not imitate..
FABO Gold Member
- Jan 1, 2018
- Reaction score
- Southwest VA
Thanks for refreshing my memory, and I agree completely! I’ve been stuck in the five pin past because the last four or so I’ve been in on getting running again have been seventies (and some early eighties) trucks with original Chrysler ECUs. And I would not be surprised if some of those aren’t 4 pin in disguise. But it does make me wonder why they didn’t eliminate the fake transistor on the newer four pin setups.You are wasting time with the 4 pin ballast. That box is a 4 pin box and it only needs a 2 terminal resistor. The fact is, unless you run into some "new old stock," you cannot BUY a 5 pin box. The fact that the box actually has 5 pins is meaningless. The 5th pin is not connected, a dummy. The only way to tell a fake 5 pin from a real 5 pin is to ohm the "5th" pin to all the rest.
HOW DO I KNOW for certain that this is a 4 pin box? Because the transistor on the box is fake.
HOW DO you tell for sure? easy. With engine running, touch one finger to the ECU box (not the heat sink) and another finger to the transistor. If you don't get shocked, wet one finger and try again. You won't. It's fake. The real transistor on the newer replacement boxes is inside the box