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Roger
Roger, BMW Master Tech
Category: BMW
Satisfied Customers: 3045
Experience:  10 yrs. experience as BMW Master Technician, shop foreman and dealer.
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Either i'm buying 3 to 4 bad reman alternators or my car has

Customer Question

Either i'm buying 3 to 4 bad reman alternators or my car has going nuts. My battery light stays on and my alternator isn't charging. My battery is good.
JA: OK. To minimize me, please click the down arrow at the top right corner of this box.
Customer: Oh yeah, the alternator are reman bosch oem 140 amps. My car is a 1996 BMW 740il been having it now for 16 years.
JA: Have you checked all the fuses? Do you have a wiring diagram?
Customer: I was wondering is there's a fuse that would cause that to happen ?
JA: Are you fixing your 740il yourself? What have you tried so far?
Customer: No wire diagrams.
JA: Anything else you want the mechanic to know before I connect you?
Customer: yes, i do everything myself.
Submitted: 1 year ago.
Category: BMW
Customer: replied 1 year ago.
My gmail account is not working. Please use***@******.*** to respond with answer to my question thank you.
Expert:  Chad Farhat replied 1 year ago.

Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.

Customer: replied 1 year ago.
ok thanks !
Expert:  Chad Farhat replied 1 year ago.

let me look up the circuit for it for you be right back

Chad

Customer: replied 1 year ago.
ok
Customer: replied 1 year ago.
No thanks
Expert:  Chad Farhat replied 1 year ago.

no thanks on what ?

if you seeing a phone call request , ignore it, i m not the one sending it , the system does

there is a 10 AMP fuse it will be fuse #22, did you check that one

i sent you the circuit for your review

Please let me know

Thank You

Chad Farhat

ASE Certified Technician

Customer: replied 1 year ago.
Hello are you still there ?
Expert:  Chad Farhat replied 1 year ago.

yea i m here , this not texting , there will be a small delay to get your reply back

Customer: replied 1 year ago.
No sir, I didn't check it.
Expert:  Chad Farhat replied 1 year ago.

ok cool , lets check maybe that is it ,

if not we have other stuff to check

Please let me know

Thank You

Chad Farhat

ASE Certified Technician

Customer: replied 1 year ago.
Ok going to check it now be right back sir.
Expert:  Chad Farhat replied 1 year ago.

Component ID F17 (Fuse 17) to F32 (Fuse 32) Location Rear RH Side Of Engine Compartment

Customer: replied 1 year ago.
22 10 fuse is good
Expert:  Chad Farhat replied 1 year ago.

you have 3 wires on the alternator plug correct ?

Customer: replied 1 year ago.
Ok going to check #F17 & F32 in trunk
Expert:  Chad Farhat replied 1 year ago.

The F22 is located in the engine front box , that has fuses f17 to fuses f32 .

so no need to go to rear trunk , i m sorry

Customer: replied 1 year ago.
they are good
Customer: replied 1 year ago.
I have two wires bolted to the back of the alternator and one plug that has two small wires in it.
Customer: replied 1 year ago.
On the plug itself it only have two wires.
Expert:  Chad Farhat replied 1 year ago.

1-has the alternator ever fixed the problem for a while or you never had it charging the battery, the light came on and you changed 3 alternators still same thing?

2-forget the battery light for now

if you put a voltmeter on batter while car running are you getting 14 volts

if your battery is s dead (having the alternator charge a near dead battery), will blow the diodes in the alternator, thus causing it to not be able to charge the battery.

Expert:  Chad Farhat replied 1 year ago.

i want you to unplug the abs connector and crank up the car tell if battery light goes out

have you checked the battery cable between alternator & battery ?

Customer: replied 1 year ago.
I have 3 chargers and I always made sure the battery was fully charged. The alternator from autozone made the light go out for about 5mins but had the car running bad. The other two was doa and the last one light when out for about 10 sec.
Customer: replied 1 year ago.
I even replaced the starter.
Expert:  Chad Farhat replied 1 year ago.

unplug abs & let me know

Customer: replied 1 year ago.
It started the car but it sometime cranked for 5 to 7 sec before it started. When I took it off the car I noticed that on the starter it have a wire going to a 30h on the starter that wire had a little cut in the insulation I taped it good.
Customer: replied 1 year ago.
But it didn't seem like it reached the wire inside.
Customer: replied 1 year ago.
The fuse or the abs plug ?
Expert:  Chad Farhat replied 1 year ago.

the abs plug connector disconnected complete and start the car

Customer: replied 1 year ago.
I took out # 17 light still on and car won't start.
Customer: replied 1 year ago.
put it back car cranked.
Customer: replied 1 year ago.
Where is the main abs plug ?