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Old 02-03-2025, 03:14 PM
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sufficient, stable voltage

Quote:
Originally Posted by shevin View Post
...my 12V battery is Old but it reads on 11.5V (when not running)....

Quote:
Originally Posted by getty150
For starters a fully powered battery is a must with these cars! Every electrical powered component needs to have its full allotment of power.
This I've come to learn when dealing with these components of the BMW.
I agree with the above; I've gotten many problems when testing components with engine off, and battery dipping to 11.5v or so, and later, when my battery had reached the end of its' life (12.0v resting, at 3+ y.o.), the problems grew worse (no start, no crank, EWS, immobiliser, tranny control module).

A new battery solved the latter set of problems, and I bought and use a 20 amp stable/constant power supply to use when testing with the engine off (20 amps is enough for pre-facelift E53's when for testing, not coding; 50 amps or more is better if coding is the goal).
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01 BMW X5 E53,3.0i-5L40E, 7/13/01
topas-blau,Leder-grau,"resto-project car"

Here:
14 Lexus ES350,3.5L-U660E
09 HHR Panel,2.2L-4T45E
04 Chevy 2500HD,6.0L-4L80E
98 GMC Sierra 1500,5.7L-4L60E

Gone:
66 Chevelle Malibu 2dr ht.,327>441c.i.-TH350>PGlide/transbrake
08 Cobalt Coupe,2.2L-4T45E
69 & 75 C10s,350c.i.-TH350
86 S10,2.8L-700R4
73 Volvo 142,2.0L-MT4
72 & 73 VW SuperBeetles,1.6l-MT4
64 VW,1.2l-MT4
67 Dodge Monaco 500 2dr ht.,383c.i.-A727
56 Chevy 210 4dr,265c.i.-PGlide
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