Rear ABS light
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5th Wheeling
Joined: Oct 2023
Posts: 28
Likes: 0
From: Nevada
Rear ABS light
Hey everyone I need some help diagnosing my problem. I have a 1992 f250 and the rear ABS light is off when I first start the truck and my foot is on the brake. But as soon as I take my foot off the brake it turns on and stays on. I have replaced my brakes, parking brake cables, and the rear ABS sensor. However none of this has helped to turn it off. Any help on the matter would be greatly appreciated, thanks in advance!
Mountain Pass
Joined: Oct 2021
Posts: 222
Likes: 60
There is a single female connector on the wiring harness under LH dash, next to parking brake mechanism. It's hanging there with nothing plugged into it. You ground it with a jumper to a clean ground, make sure it's a good ground. When you switch on ignition, it will flash the light on the dash, giving you a code as to what's wrong. The info is on this site and all over the internet. The only item I never found info about regarding this is that if you have changed rear lights to LED, RABS will give a bad bulb code. In that case, put a Load Resistor between brake pedal switch lead and ground. Can't remember which color code on lead, but it's the one that goes to Turn Signal (multifunction switch)
I think I used 6ohms 25watt
Screw it to metal under there to help it dissipate heat.
The codes are a must or you will be chasing your tail for days.
Also, the connector on the Master Cylinder will give codes from flakey connections there
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