When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
97 2500 no tach, no ac, no volts ,no cruse all items went off at the same time. Changed the alt, no luck went to the local auto store, alt checks out fine....now someone asked for me to check the fuseable links. Schematic dont show one between the PCM and alt. it there another one I can't see? Or do I just pony up and get a new PCM. Any advice would be helpful
The voltage regulator is integrated in the PCM of these trucks. So if that is indeed the problem you're hosed and just got bite the bullet to get another.
Make absolutely 100% sure it's the problem before you go shelling out the money for a new PCM.
Do you have access to a high end scanner that can monitor PCM values? If so, you should be able to see alt output, and if it is volt regulator, it would be visible there. Otherwise, check key off draw. SOmething may be pulling it down. Also double check the numerous chassis and body grounds to make sure connections are clean and tight.