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The GEN lights, both GEN1 and GEN2, are used by the alternator exciter circuits. If power isn't flowing thru the bulb the alternator will not excite. For what ever reason GM wired the GEN1 exciter circuit and the heater to use the same fuse. When the fan is blowing it is robbing some juice from...

Sorry for the poor wording of my earlier post. As a site member you can start a new thread. Just go the Forum you want to post in and the click on the "New Thread" button towards the top of the page. We will be glad to help you work thru the issues you are having with your truck. I just...

Instead of piggybacking this thread why don't you start a new one. Looks like we will need to do some troubleshooting on your system.

The trucks where designed that way. Take the instrument cluster out and clean it. It needs it anyway at is has 25+ years of dirt on it. Use the troubleshooting section of the TMs to find your problem. No need to reinvent the wheel. The design works. One thing you do need to do is the Starter...

Welcome to SteelSoldiers. Read this thread. It may help. http://www.steelsoldiers.com/cucv/54292-cucv-alternator-symptoms-diagnosis-fix.html Have you downloaded the FREE technical manuals for the truck?

Already covered this http://www.steelsoldiers.com/cucv/63308-instrument-cluster-questions.html Post #6