OK, I've read 7 threads on this. Can't find an answer yet.
05 Roadster
58k
Garage kept, rarely sees rain. not driven since late November. It had no problems last year.
Battery is good, fully charged. I charged it with my 2/10 amp battery charger. And it starts fine.

The battery goes flat in a day or two, in storage My ammeter reads 1.6 amp draw, with key out, doors closed!!! I have pulled every fuse, one at a time, the draw does not change.

I read about a faulty alternator diode. I didn't see a testing procedure on it.

If anyone has any thoughts on where to go from here, it would be appreciated.

 

Any chance that rodents have feasted on the wiring while the car has been stored? When started, did everything function as it should?

 

See if you still have the draw with the 3 big Fuses pulled. The 200A and the two 50A. If those are out the only things left are the starter and the generator.

 

I see no traces of mice. They are in the area though, they keep eating the green mouse food l leave out for them. The RCM box is clean. The fuse box is clean.

 

200a, and 50a fuses? Where would they be?

 

The small black box with the flip up lid in front of the RCM and battery. If you disconnect one at a time you might at least narrow it down.

 

The only one that stopped the draw was the 200A. But that one disconnects the battery itself. Another strange thing is, every time l connect the ammeter, it's backwards, meaning if l put the + on the - post, and the - on the cable, it reads negative amps. But if I disconnect, and re connect, ( the same way), it reads correct.

 

EDIT ! I removed the previous text as it was in error, I looked at the wiring diagrams incorrectly.

The 200 AMP fuse ( F4 ) powers everything in the car except :

The radiator fan ( F2 - 50 amp )
and the ABS brakes and pulse module ( F3 - 50 amp)

Starting on 8W-10-9 of the 2005 SRT6 service manual, you can identify all the feeds for F4.

 

Then that means it's not the starter or generater. Check The schematic for the power distribution sheet. Follow all of the supplies through the 200 amp fuse and disconnect those fuses one by one. And by 6 amps you mean 6.0 A? Not 6.0 mA?

 

The draw is 1.6A. I'll check these suggestions tomorrow. Many thanks to all. I'll keep at it, and be sure post the outcome.

 

I show the fan as 50A fuse # 2

 

The 200A fuse feeds to splice block 100 then goes almost everywhere. Did you check the glove box lamp, trunk lamp. They are known to stick on.

 

I finally got the XF out of the shed. Frost heaves jacked up one of the doors, and I couldn't get it out of the shed, and into the garage, where I could work on it properly. So I removed the glove box and trunk lamps,...no help. I then disconnected the big alternator wire,..no help. Still getting a 1.6 amp drain. Thoughts?

 

Start with the 3 BIG fuses in the box in front of the battery.
Remove the negative battery cable before touching any of them though.
Remove one fuse at a time and at least nail the drain into
1. ABS
2. RADIATOR FAN / control Module
3. everything else.

If it's "everything else, remove ALL the fuses from the under hood fuse box and put them back one at a time watching the ammeter.

That's about all I could suggest.

 

Thanx, I did try the 3 big fuses, and only the 200 amp stopped the drain. I already removed all the fuses one at a time, with no help. Would removing all the fuses, and replacing them one at a time be any different? IDK.

 

All it would prove is that the drain is not caused by anything fed by the fuse block if you remove all the fuses and the drain continues. could be some sort of feedback ?

 

If the 200 amp stopped the drain, put it back in and work downstream from there. Use the service manual schematics to know everything that feeds from that fuse. Pull one fuse at a time while watching the meter, you will find it. Just takes time.