hogdog05

Hey guys i know this is beating a dead horse, but i cant get my truck to charge. I bought new altenator and still no luck. i then swapped the relays around on the drivers fender no luck. connections look tight on the wiring harness and the crank sensor. i dont know how to tell if the crank sensor is workin correctly or if the regulator is. NEED HELP ASAP, this is my daily driver and trying to hustle my wife around then me go to work is not working out so good.

Philip

Ok here is the way to test your CPS.

Black/blue tracer is the sensor ground wire. It should OHM close to zero to the battery ground.

Tan/yellow tracer is the 8 volt power feed to the sensor. The voltage regulators on the PCM's are kind of loose. This voltage can vary around some.

Gray/black tracer is the signal wire. If the sensor is on a smooth section of the balencer there should be little if any voltage showing. When the sensor is on one of the air gaps it should show around 5 volts.

If you have a 12 volt adjustable power supply. A 14 gage blue wire terminal will slide down over the male pins on the CPS.
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Here is a link to the complete thread

http://www.cumminsforum.com/forum/89...on-sensor.html

GIT-R-DONE

Put an external VR on it, is probably the quickest way to get it back on the road again.

hogdog05

Checked the crank sensor its showin good. put an external voltage regulator for a 91 cummins still no charge. took special care so as not to burn up the vr. so i am lost my understanding with a new altenator and new vr this bypasses everything and it should charge but i am lost. any help greatly appreciated. not real for sure how to test the vr to make sure its good or not.

Richie O

Just because you have a new alt don't think the problem must be something else. Aftermarket electronics are all junk.

Trebor

Check for +12 volts at the big battery terminal on the alternator. If it is absent then trace back to see if there is an open fusible link in this circuit.