won't start turn key no clicking or turning over complete silence

40

Asked by May 25, 2015 at 10:40 PM about the 1988 BMW 5 Series 528e Sedan RWD

Question type: Maintenance & Repair

battery discharged, doors auto locked. Put in battery (not new) checked good at parts
store 12.6 volts Head lights tail lights won't work most everything else does. Volt meter
on positive terminal,  showed 12.6 volts checked engine, screws in firewall, body, voltage
12.6. Is there something that keeps car from starting because of battery, maybe a reset
somewhere, Got any ideas?

9 Answers

14,060

tiler, you are going to have to check every fuse and relay you can find in the car. also, make sure your grounds are clean and tight. if you get it going, then you are going to have to do a parasitic draw test to see why the battery died like that in the first place. fairly easy procedure with a multi-meter just google it.

1 people found this helpful.
40

battery was old set for several months, will do what you suggest fuses good thanks

130

A battery that reads 12.6 volts is not a good, charged, battery. A fully charged battery will read at least 13.2 volts to 14.4 volts. You need to do a load test to see what the voltage drop is. That is what tells you the condition of the plates in the battery. A used battery is just exactly that. A USED BATTERY.

2 people found this helpful.
130

The solenoid controls the power going to the starter. The ignition switch controls the power to the solenoid. That is what clicks when you have a bad (low) battery. Remember the car is computer controlled.

1 people found this helpful.
40

no clicking, complete silence most everything else electrical works but try a new battery thanks

3 people found this helpful.
40

main relay, pole 30 getting battery voltage, suppose to get a minus dc voltage on pole 87, getting nothing going to try and clean all grounds, still checking. Key does not have a chip in it. Thanks for suggestions

14,060

Have you tried shorting across the solenoid at the starter to see if the engine turns over?

40

I will go try when it quits rainung

1 people found this helpful.

It's the key has lost signal to the ignition switch, this happened to me and I tried the other key and it work fine. Still don't know how to fix that key yet

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