esof - 4hi works, 4lo doesn't. couple questions - Ford Powerstroke Diesel Forum
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post #1 of 1 Old 04-05-2013, 04:57 PM Thread Starter Rookie
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esof - 4hi works, 4lo doesn't. couple questions

I'm not super familiar with these trucks.

It's the truck in my sig.

Do 03 trucks have GEM modules? I am fairly sure my 4wd system is run through the 4wd module behind the glove box. At least, I have some sort of module back there.

I've checked my relays, and clearly power gets to the motor and the motor shifts it to 4hi. So I'm inclined to think all that works. shift motor, relays, etc.

Truck will start in any gear though. Also, I have phantom interior issues. The door light works, but using the switches for the dome lights sometimes works, sometimes doesn't. Door chime sometimes works, sometimes doesn't. I'm wondering if the truck has a GEM maybe it's that. If it controls the relays.

Also, neither the 4hi nor the 4lo lights illuminate when starting the truck when all the lights are supposed to momentarily illuminate. They used to, but don't anymore

Other possibility is a broken range sensor wire or neutral safety?

I'm yet to nail down a wiring diagram for the 4wd system for my year truck.

Someone please point me in a direction here. This has been p***ing me off for almost 2 years and i've spent too much time troubleshooting my truck and too much time searching online to only come up empty handed.

2003 F250 SD 4x4 3.73 SCSB VE powered 12 valve Cummins
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, lots of motor power ups, NADP Heavy Hauler 4R100, PCS Controller, 4" Lift, 35" BFG MT. Somewhere north of 400hp
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Last edited by rlebar; 04-05-2013 at 06:15 PM.
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