Looking for advice on what to do next...
A few years ago the wiring in my 66 SS started going on the fritz. I looked behind the dash and it was a train wreck and started to have a parasitic drain.
I have spent the past year installing a painless wiring system. New, upgraded bulkhead, knife style fuses, rewired front to back. She fire right up! 🎉🎉
But, still have a drain on the battery. I removed the fuses from the bulkhead for systems I don't use (radio, AC, fan, etc.). I then tested each of the fuses with a multimeter to see if I could pinpoint the drain. I could not find a voltage drop at 20mV DC across any of the fuses. I tested using the multimeter and touching each side of the fuses from the backside of the fuses.
The battery was about 5 years old, so, I replaced the battery. Good right? No.
Last weekend I was driving at night and slowly watched everything go dead. A friend met me, charged the battery and followed me until it went dead again and recharged until I got home. Pretty scary doing this at 11pm on the side of the Interstate...
So, this made me think it was the alternator. Although I tested it with the multimeter across the battery posts with the car running and couldn't see an issue, I still had a battery drain and felt maybe the diode was going bad. So, i replaced it. Good, right? No 😡😡
I checked the battery this morning and it's dead again...
What am I not looking at?? Any advice is much appreciated!!!