Question about electronics

[E.D.75GMC]

First off, I know almost nothing about electronics. That being said, when I'm driving my truck after dark and I slow and then stop at a red light my headlights and dash lights dim a very noticeable amount. The battery currently in the truck is good, and I believe the alternator is basically the same as OEM (I don't know its age though). The dimming has got much worse over the past few days and if I'm stopped in a turn lane the signal lights slow to the point where I can count two full seconds between the blinks. Is this my alternator dying? Or possibly something else?

[mrolds88]

Possibly. First (and cheapest) thing I would do would be to pull the alternator and clean the terminals and the mounts. Then check everything again. Also check your battery cable connections. I had an S-10 once that did the same thing on a single trip, to the point that it died on me. Pulled the alternator to get it checked, and it put out full output. Work perfectly for the next 120,000 miles. It had a bit of corrosion on the ground.

[motornut]

yup check/clean light grounds
i had one run real slow,found the ground wire broken @ light plug,
but check fender too ,replace if hard baked,stiff

[E.D.75GMC]

Okay thanks guys I'll check it out