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Re: My 2004 bmw 525i wont start or crank although the...
Won't crank????? Starter motor probably. Crank but won't run...fuel pump, crank sensor, coil pack and/or computer.
could also be the relay sending full juice to the starter motor.
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Why was the battery missing to begin with? I would start by checking all fuses under dash and Central hub. Check for burned in-line fuses,if any, coming off of battery cables.
not a BMW expert but had this same problem, it has to be very near the battery, best advice is follow the 12 volts out and look first for a bad cable (positive is more common but neg can do it) that is broken inside, In my case it was right where the Pos cable came off the battery, 2 inches away at T junction where the cable splits and there were two cables ---voltage the battery and not four inches to the left of it.
If u hear the engine cranking in the AM, the batt & alt sound good. If you don't get any engine cranking in the am you may have an electrical short draining the battery. Before u convict the starter u must make sure the battery has full power in the AM. (12V) & 12 V to the starter
sounds like a loose connection to starter motor not allowing full power to solenoid which is where power lead connects. or if it is a second hand starter could be faulty solenoid
engine could be seized...:( sorry...or a hose could have blown (radiator) and hurt or disconnected a main electrical line ...check fuses battery and cables..there is a bulkhead power junction on firewall high rt. side(passenger) immediately next to engine..battery located under back seat passenger side...first thing though..make sure you can turn the motor over by hand (breaker bar on nut at crank pulley) to determine if it is not siezed...good luck
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