Posted By: Ciscodog
Trouble finding electrolysis source - 06/09/11 05:07 AM
I just replaced the radiator and fans in my Dart. I did the test for electrolysis and it's showing .7 VDC. Here's the kicker - it does it with the battery disconnected too. I've checked everything and I'm at a loss, so maybe someone will have an idea that I haven't thought of yet. Here's the rundown on the car so you know what I'm working with:
- '69 Dart
- Factory items go through factory fuse block
- Aftermarket items go through painless fuse block
- No aftermarket items use chassis ground. All grounds go to #8 wire to battery
- Elec fuel pump
- Elec Water pump
- Elec fans
- MSD 6AL, 8680, and digital multi retard
- NOS progressive controller
- Line lock
- East Coast 1 wire alt
All items going through relays, which were pulled with no change. The MSD was completely disconnected because it has a capacitor - no change. Changed distilled water - voltage returned. Volt meter is registering .1 VDC when I touch probe to the temp sender at the water pump. The .7 VDC reading drops to .4 when I turn the lights on (not runing). I'm going to try a different volt meter tomorrow but I have ZERO reason to doubt my meter because it's not acting odd in any other way. It reads 12.5 on my battery w/car off. The car runs and all systems operate correctly, so no particular component is acting weird. This one has me stumped. Any help would be appreciated - thanks guys.
EDIT - I have a #8 wire going from the battery to a pass-thru in the firewall. Everything under the hood grounds to the stud. Everything under the dash grounds to the stud. So there's a direct line to the battery, and no chassis grounds for aftermarket stuff.
- '69 Dart
- Factory items go through factory fuse block
- Aftermarket items go through painless fuse block
- No aftermarket items use chassis ground. All grounds go to #8 wire to battery
- Elec fuel pump
- Elec Water pump
- Elec fans
- MSD 6AL, 8680, and digital multi retard
- NOS progressive controller
- Line lock
- East Coast 1 wire alt
All items going through relays, which were pulled with no change. The MSD was completely disconnected because it has a capacitor - no change. Changed distilled water - voltage returned. Volt meter is registering .1 VDC when I touch probe to the temp sender at the water pump. The .7 VDC reading drops to .4 when I turn the lights on (not runing). I'm going to try a different volt meter tomorrow but I have ZERO reason to doubt my meter because it's not acting odd in any other way. It reads 12.5 on my battery w/car off. The car runs and all systems operate correctly, so no particular component is acting weird. This one has me stumped. Any help would be appreciated - thanks guys.
EDIT - I have a #8 wire going from the battery to a pass-thru in the firewall. Everything under the hood grounds to the stud. Everything under the dash grounds to the stud. So there's a direct line to the battery, and no chassis grounds for aftermarket stuff.