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mike_m3
03-08-2003, 12:01 PM
I posted a few days ago about some rather weird after effects of a dead battery. After jumping the car it ran fine but my windows, sunroof, parts of the instrument cluster, etc did not work. The car would not even go as far as telling the diagnostic computer its vin number. The dealer first diagnosed this as a blown "body module"..
The interesting thing is after sitting on a charger overnight at the dealer (I drove the car for 45 minutes before dropping it off at the dealer so the battery should have been charged) the computer must have had a revelation (or just reset) and everything is working fine without having to replace any modules.. They tested my battery and alternator output and found both to be within spec. Just kind of odd.
The lesson here is that if your car will be sitting for more than 2 weeks or so its probably best to have it on a trickle charger to avoid this kind of BS.<br><br><br><br><a href="http://m3.madrussian.net"><img src="http://www.osbdesign.com/webpics/m3.jpg" border=0></a><br><br><br>

cbailey781
03-08-2003, 12:53 PM
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<img src="http://members.roadfly.com/cbailey781/signature.JPG">

mike_m3
03-08-2003, 01:00 PM
the battery will be down to below starting levels at around 3 weeks (obviously temperature dependent) - I've found this to be true, even in an attached garage which typically does not go much below 50 degrees. If you try to start it then you will waste pretty much most of what's left in the battery and if it sits a bit longer it will go completely dead - which is what happened to me. Just a general PIA.<br><br><br><br><a href="http://m3.madrussian.net"><img src="http://www.osbdesign.com/webpics/m3.jpg" border=0></a><br><br><br>

rheacox
03-08-2003, 02:06 PM
running the 13.5# Hawker battery this is very useful info. I have disconnected my battery numerous times and have had no problems but I\'m taking your advice on the trickle charger if my car will sit for more than three, or so, days to avoid potential problems.<br> '03 M3 on a DIET (home-built CSL, almost as light, soon to be lighter, than the rest-of-world CSL but with AC and power windows), IR/SMG coupe (no other options), 13.5# Hawker battery, Eisenmann Meisterschaft Ti. exhaust, 15# funky racing seats, SSR Comps, Hawk HPS pads, Euro rotors, 1" lower front and rear by heating stock springs, front license plate nylon-tied to lower intake grill, GC or other weight saving anti-sways soon and Wilwood alloy calipers if I can engineer it.

GMW/CSL = '88 M3 coupe, ZO6 engine, 6-speed Camaro tranny, almost finished for a serious 2800# CSL with 400 HP to wheels

Mike
03-08-2003, 02:49 PM

Apexhunter
03-08-2003, 03:33 PM
<br>"Flat until you see God, then brake" - annonymous

Apexhunter
03-08-2003, 03:36 PM
Uhh..."1" lower front and rear by heating stock springs"

!@#%@## This anin't no rice car. What were you thinking, but down the glue and do it proper!!!! Blasphemy!!! Ughh....



I've gained my composure...right.


>>>apex.<br>"Flat until you see God, then brake" - annonymous


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