Discussion Starter · #1 ·
I am at my witts end with charging system in my car, it is an 82 Z-28 with a 406 and my problem is that as under hood temps build up as they do in these cars, the alternator begins to quit charging. The problem was there when I had the 10si style alternator and I thought that the alternator was going bad, but turns out that as it got hot it would do the same thing when at or near idle. So I bought a Powermaster CS 130 style alternator with 145 amps, same problem, charging drops off to only 12.5 or so volts from the 14.8 before things get hot. I am still running the original charge wire that appears to be about 10-12 gauge wire but I also run a 4 gauge wire direct to the battery that is fused to help keep battery charged as well as grounds galore from the alternator case, engine and to the frame rails and body with a total of about 5 or 6 of all sizes and gauges. I run dual electric fans with a Flexalite controller that is wired direct to that battery per their instructions and when the fans are running with my headlights on at idle which is about 900 rpm, the voltage starts dropping as things get hot under the hood. The car is not overheating, just the underhood temps heat up. Before that happens, the voltage starts out at 14.8 checked at the battery and the altenator. How much heat will cause alternators to slowly stop charging or is it the original charge lead in stock wire harness? Should I wrap the headers to help keep excess heat out since the car is just my toy and does not see rain? Open to suggestions or ideas on how to combat this problem. Sorry for the long post, just wanted to be as detailed as I could. Thanks for help.