Jeff777

The problem seems to have been the CCU. I sent it to Bergvill FX and they replaced the transistor which was an incorrect part and did some modifications. The battery draw is now 20 ma. Good service at a reasonable price. Thanks Tore B!

misterbeverlyhills

My door locks flash 22 times before settling down to the regular beat. I have a borrowed CCU to see if that was the problem but it didn't change the drain; the car drains down overnight, battery is new.

Any ideas?

Foxman

Nothing worse than electrical gremlins. Check out this thread with some helpful troubleshooting tips from Boxsey911. It could be as simple as turning the interior lights to the off position. https://rennlist.com/forums/964-foru...k-problem.html

Jeff777

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Jeff777

misterbeverlyhills

Tomorrow

misterbeverlyhills

So far so good, seems like it was door switches. I did tell the indie to check them first but $450 in labor to check the whole system didn't do it. Till we changed the door switches, no charge, 10 minutes.

Tarek307

Door switches are very common it seems, also the AC unit fan sometimes is a culprit, i've seen a couple of 964's with switches to cut the power to the whole climate control unit to remedy that issue

Earlydays

....add glove box and front trunk light switches to the culprit list.

Railmaster.

The fan motors must be like 2A each, not 20A?!

ToreB

I am not sure what the exact fan motor rating is, but they two main blowers as well as the rear fan are drawing 15-20 Ampere on full speed. Fuse 1 (30A) is common for the two front fans, and this is also the rear fan fuse rating.
Cheers,
Tore

Railmaster.

Thanks! I try to learn something every day! / Jacob

911chick

Hi guys,

I've lurked on Rennlist for years, but finally registered to post this question. I've read many threads on battery drain and haven't seen my specific question. I'll be printing this thread to try things one by one before taking the car into a local independent mechanic. I have a 2001 911 Cab. The PO put in an aftermarket stereo system which had an incorrectly installed ground wire. I had that fixed years ago and it mostly fixed my battery issues. But now, suddenly, if I park the car overnight, the battery acts completely dead and must be jumped. A real pain when the car is in valet parking, I discovered recently. The weird thing is that once it's jumped and running, you can turn it off immediately and it'll start right up. I'll take it to run errands, turning it off every 15 minutes or so, and it always starts up. Parked for 3 hours is ok, 6 hours is ok, but overnight and it's dead.

The headlight/fog light switch/**** is permanently pulled out, so the fog lights are on when the car is on, but that's been like that for 2 years, so I don't think that's it. The one thing I'm not sure of is the locking center console....both of my latches are broken so maybe there's some alarm thing that's getting triggered. Also, I get this weird (usually passenger side) window going up and down an inch or so as the car is starting back up. The "key" button lights flashing on the dash, too. I've been just disconnecting the negative battery cable for now, until I can get the time to just spend all day in the garage. My husband isn't a "car guy", has never driven it, maybe been a passenger once. He's fed up with this and is hinting it needs to find a new home. Help!

Railmaster.

How old is Your battery? It could be completey shot if seven or even as little as five years old and act as You describe it!

911chick

Thanks for the input. I had no idea it could still work at all if it was basically dead. The battery is five years old, the car has been driven about 11K miles in that time. (two neck surgeries prevented driving it for a while, sadly) It gets plugged in to a battery tender if it's not going to be driven for even two or three days. When this started happening, we noticed that when we plugged it in, the tender would never cycle to green (indicating it was fully charged). Then I'd start the car, turn it off and it would then show green, as if there was some type of bump needed to push it up. My hubby has been noting voltage when it's plugged in, not plugged in, with negative disconnected, etc. Of course, I can't find that notepaper right now to give you the numbers.

Should I pull the battery and have it tested? I am heading into town to Costco later.