Battery drain troubleshooting
Posted: Fri Feb 14, 2020 1:18 pm
First off, my apologies for starting a new thread. I see this is pretty common, but I haven't been able to figure out my issue. Here is what's happening:
-'88 GW has a slow drain if left without starting for awhile.
- When started with a good charge, the voltage reads around 12.4-12.6, then moves to 13 in a minute or so. If no other drain is applied to the system, the voltage runs up to 14.6-14.7 and generally stays in that range.
- if I turn on the headlights, or the heater, the voltage drops down to around 13 and then gradually drains the battery until it won't run.
My system:
- 360 with Holley Sniper
- Newish starter
- New alternator - high output
- Newish battery (recently tested good)
- New voltage regulator
- New battery cable set
I've checked the engine and frame ground and both are solid and clean. I also fixed all the previous owner slice/dice on the wiring harness from the alternator to the voltage regulator. I have NOT replaced the fusible links in the runs to the voltage regulator, but have inspected them and they look pretty clean. I have tried to isolate the drain through fuse box, but have not been successful.
Any thoughts or places that I've missed? I'm getting pretty frustrated that I can find this. Seems like it should be simple.
-'88 GW has a slow drain if left without starting for awhile.
- When started with a good charge, the voltage reads around 12.4-12.6, then moves to 13 in a minute or so. If no other drain is applied to the system, the voltage runs up to 14.6-14.7 and generally stays in that range.
- if I turn on the headlights, or the heater, the voltage drops down to around 13 and then gradually drains the battery until it won't run.
My system:
- 360 with Holley Sniper
- Newish starter
- New alternator - high output
- Newish battery (recently tested good)
- New voltage regulator
- New battery cable set
I've checked the engine and frame ground and both are solid and clean. I also fixed all the previous owner slice/dice on the wiring harness from the alternator to the voltage regulator. I have NOT replaced the fusible links in the runs to the voltage regulator, but have inspected them and they look pretty clean. I have tried to isolate the drain through fuse box, but have not been successful.
Any thoughts or places that I've missed? I'm getting pretty frustrated that I can find this. Seems like it should be simple.