Parasitic drain on battery.

[Timco]

Ok. Battery has been to a couple auto places. Charged & load tested. Both passed it.

I don't have a tool that does amps through the leads. Just amp probe type. Those say about .04-.06A DC. Seems no major draw.

My tender says its 37% after sitting a week. Then it tops off in about 30-40 min with a 3A maintainer / charger. Brand new auto tend / charger.

Just tried all 3 testers. Newer one does say 1.3A across ground to neg post on batt. I'll track this down. Thanks.

Update. Pulled every fuse individually. No change.

[Jamesp]

Originally Posted by Timco

Ok. Battery has been to a couple auto places. Charged & load tested. Both passed it.

I don't have a tool that does amps through the leads. Just amp probe type. Those say about .04-.06A DC. Seems no major draw.

My tender says its 37% after sitting a week. Then it tops off in about 30-40 min with a 3A maintainer / charger. Brand new auto tend / charger.

Just tried all 3 testers. Newer one does say 1.3A across ground to neg post on batt. I'll track this down. Thanks.

Update. Pulled every fuse individually. No change.

Me, I'd suspect the alternator diodes and pull the connectors to the alternator and check again. Don't let them go to ground when checking or you'll smoke the electrical harness.

[Jamesp]

I did chase down a similar problem on a 72 Duster where we still had a leak with all the fuses pulled. In that case we were able to pull a firewall multiple connector and go pin to pin finding out it was a "seatbelt interconnect" box buried in the dash. We disconnected it and the leak stopped. Everything still worked on the car and we never did figure out what that box did other than draining the battery. I don't know where the harness production break is in the Boxster but I imagine there is one somewhere.

[BYprodriver]

Originally Posted by Jamesp

I did chase down a similar problem on a 72 Duster where we still had a leak with all the fuses pulled. In that case we were able to pull a firewall multiple connector and go pin to pin finding out it was a "seatbelt interconnect" box buried in the dash. We disconnected it and the leak stopped. Everything still worked on the car and we never did figure out what that box did other than draining the battery. I don't know where the harness production break is in the Boxster but I imagine there is one somewhere.

Are you sure it was a 1972? In 1974 it was a law that 1974 cars would not start unless the seat belt was fastened. May have started in 1973, but it was repealed in 2 or 3 years. My 1974 TransAm (455SD 4-speed) had the interconnect box on the starter side inner fender.

[Jamesp]

Originally Posted by BYprodriver

Are you sure it was a 1972? In 1974 it was a law that 1974 cars would not start unless the seat belt was fastened. May have started in 1973, but it was repealed in 2 or 3 years. My 1974 TransAm (455SD 4-speed) had the interconnect box on the starter side inner fender.

Pretty sure it was a 72 (was my room mates car). It would certainly start without the belts fastened because in those days nobody used them.

[Timco]

Originally Posted by Jamesp

Me, I'd suspect the alternator diodes and pull the connectors to the alternator and check again. Don't let them go to ground when checking or you'll smoke the electrical harness.

New alternator.

[Fintro11]

Originally Posted by Timco

New alternator.

Never think that a new part can't be the problem