What reasons would cause abs light come on on my 94 Jimmy?

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triple posted, one anon then with Jimmy
read your last post.
get it serviced.
you cant turn it off

you repair cause!
and it turns its SELF off.

Thats a big possibility. The abs light is on telling the driver the abs system is disabled. And the regular brake light could be on because the parking brake is not released.

No breaker. Inside the under hood fuse and relay box there is a relay and fuse. You need to take it to a shop and have them scan for the reason why the light is on. That way you don't throw parts at it until one of them fixes it.

have checked the play in the distributor shaft gear . excessive play can cause a timing problem for a moment. also has the service engine soon light came on with a code 42 for the ignition system. ignition control module can cause this concern also.

The ABS would not shut off the engine, I suspect something with the engine is causing the shut down (fuel pump, or other things) and the ABS light gets triggered during that event.

the best way to diagnose this problem would be with a scan tool while driving and watching the speed sensors, or check all your wheel tone rings make sure there are no cracks and they are clean, also have the computer scaned for abs codes there should be a code that may tell you which wheel speed sensor is acting up,you can also check the wiring, these seem to chaf the wiring by the control arm .a bad wheel bearing may also cause this problem, i would start with a scan of the abs system,good luck.

There was a recall on the ABS system on your truck. The problem was the ABS sensor on the front wheels were getting dirty and corroded causing a faults signal to the ABS module. The fix was to inspect the ABS sensor and clean them with brake parts cleaner and re-gap the sensor to the speed ring on the hub. The ABS sensor and speed ring is on the inside of the front wheel hub, spry brake parts cleaner and re-gap the sensor to the speed ring with paper folded 5 times. I feeler gauge will work but put a paper between the sensor and gauge cause the sensor is magnetic and the gauge will stick. Look for damages to the lead wire to the abs, but i think that's all fine since you did not mentioned any abs light on. You may be even lucky with just a good spray of the brake parts cleaner. Good luck and keep me posted.

I hate to say it, but the abs control module might have died on you. Thats the boxy looking thing under the hood that has a lot of brake lines and wire connectors going into it. I have seen this happen before and it ended up being one of the speed sensors on the wheels but usually its the module. Take the truck somewhere to get the light scanned, and that will give you a better idea of what it is.

likely a abs sensor at the wheel