batt. drain problem

[the911Tprocess]

All,
thought maybe someone may have advice.

my battery's started to drain a few days ago, I thought I had left something on so I went thru the car and thought I had left an interior light on. I recharged the battery's again. And again the battery's drained down to next to nothing in a matter of hours.

I recharged the battery's again and this time I put them back in the car and had a volt meter with me. I hooked up the meter to one battery, it read 12.8 Volts. In a matter of a few min. the volts were dropping and the meter read within 10 min. a volt level of 12.3 Volts.

I proceeded by removing one by one each fuse, I started at the bottom of the lower fuse box and went thru removing each fuse.

I went all the way to the top at fuse # 1 and teh volt drain stopped. In fact, the voltage started going back up. This I assume by removing the fuse, stopped the flow of current.

What I can gather is that fuse # 1 goes from the positive battery terminal thru the fuse and directly to the back of the car to the rpm transducer (looks like a metal retangular box that sits just above rear fuse box).

I remove the fuse and started the car, no problem. I put the fuse back in and removed the rpm transducer and started the car, no problem again.

Not sure what I can conclude from this, can anyone shed some light on this or provide me with a path forward.

Looking forward to hearing some feed back.

Marco

[ruf-porsche]

Could be a stuck relay somewhere.

[RSBob]

Done any wiring lately? New amp, radar detector, stereo, alarm? If so may want to go back and double check.

[the911Tprocess]

Hi All, thanks for the feedback, but no new wiring done, radio that is installed is a becker europa, it never gave any issues. I disconnected it and the drain on the battery was still measurable. The voltage I measured droped from 12.6 to 12.3 within 10 min or so. Fuse # 1 is wired directly to the positive terminal of the battery, the only thing that i could see is that the interior lights dont work when this fuse is removed. That ok. But the wiring drawing which is in the Pelican parts technical area shows that it is connected to a rpm transducer. I disconnected the fuse first, ran the car, it ran fine. I put the fuse back in, took out the rpm transducer, the still ran just the same. All this tells me that maybe I read the schematic wrong.

Could the drain which seems to be local to fuse # 1 be coming from the alternator? I seem to have read this somewhere as a possibility, this I would assume means that the Alternator must be connected somehow to fuse #1. Am I right?

Any feedback would be great, this is driving me insane.

Thanks again.

Marc

[Nitrometano]

Check if the hood light are touching the hood metal in his back. You will notice that a contact have been happened. Also check for wiring problems for the glove box light and clock gauge wiring.

[Rot 911]

Maybe you have a bad battery. How about taking the battery out of the car and see if it discharges?

[Early_S_Man]

Many have found this particular scenario to be related to the trunk [hood] lamp wiring or switch ... wire gets scraped or cracked and rubs on a 'dirty' bare spot ... not enough drain to blow a fuse, but plenty enough to drain the battery!!! Trunk lamp is on the #1 fuse circuit, too.

[the911Tprocess]

Thanks to all that replied, I have removed the fuse, so I dont have interior lights, no problem, I can still drive the car. I will check the front hood light to see if the wiring has created this problem.
Again,all that responded, thanks!
Marc