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General E46 Forum
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Old 01-20-2016, 04:42 PM   #21
dmax
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Not sure how you tested it in the car, but if it benchtested at 14v, I'm thinking the alt is good...the connection might be bad. A bad pulley wouldn't lower the voltage that much without showing other signs, like weak Power Steering.

If the issue is you're draining quickly...could be the battery...grounds...some loose connection.

Also, a bad FSR is the most common cause for the car draining overnight. Put that on the list of things to consider. Note jfoj's post above with detailed methods for diagnosing issues.

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Old 01-21-2016, 10:00 AM   #22
markusmarkus
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New Alternator. New Battery. Still having power drains/issues

If you've installed a new battery and a new/rebuilt (by Bosch, hopefully) alternator and your car still is draining you battery, it's time to go hunting.

Get a digital volt/ohm/amp meter. They're cheap at under $15!

- Set the meter to read current (amps/amperes: a measure of electrical energy flow).
- Remove the negative/ground/earth cable from the battery
- Connect one of the meter leads to the battery post
- Connect the other lead to the battery cable

DO NOT TRY TO START THE CAR.

Allow the car to go to sleep. This will take 10-15 minutes. Check the meter. It should say less than 100ma (0.1 amps). Mine reads about 50ma. If it's higher than 100ma the first suspect is the FSR. The FSR can be accessed in the lower dash on the right side of the car. It's job is to provide the heating/ac control unit with many possible fan speeds. They go bad. The usual symptom of a bad FSR is erratic fan speeds. They can also drain the battery when they go bad. Replace it with an OEM FSR.

FSR not the problem?? Start pulling fuses one at a time. That is, pull a fuse, check the meter for a significant drop in current flow, reinsert the fuse when the meter readout doesn't change. Now, just don't pull fuses randomly. Do it by system. For example, if you have an aftermarket head unit and/or amplifier, start with those fuses.

Happy hunting!

Last edited by markusmarkus; 01-21-2016 at 10:02 AM.
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Old 01-21-2016, 03:47 PM   #23
augeagle
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Thanks for all the input. I feel like an idiot coming here and explaining what happened, but maybe I can help a newb in the future. I didn't have the belt on correctly. I had it going OVER the top pulley instead of under it. This was a simple overlook that was caused by impatience and frustration. Thanks again for the help!
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Old 02-15-2016, 05:33 PM   #24
EVMadman
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I've been chasing a battery drain problem too and suspect the FSR. But when I tested the fan speeds, everything seemed normal. Can a bad FSR drain your battery but still seem to correctly adjust fan speeds?

Thanks
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Old 02-17-2016, 01:31 AM   #25
Jesus90
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Help!

I'm having the same issues can somebody help me with this problem
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