B3 E36 Battery Bad Drain (Parasitic)

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HiteshG24
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B3 E36 Battery Bad Drain (Parasitic)

Post by HiteshG24 » Thu May 26, 2022 6:14 pm

Hi Folks,

Hope you're all well,

I have an alpina b3 e36 1994 for the last several years, since ive owned the car there has been a battery drain.

Things i have checked/replaced :

- New alternator
- Removed glove box, boot and bonnet bulbs
- Checked wires in the that go to bootlid for broken/crushed cables
- Alarm not activated
- No lights, ignition or stereo left on
- Brand new battery
- Disconnected old tracker

Running out of options, any help will be massive help.

Thank you

H

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JohnW
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Re: B3 E36 Battery Bad Drain (Parasitic)

Post by JohnW » Fri May 27, 2022 12:10 am

Sometimes the fan speed control resistor goes faulty and activates when not in use. There are two different types from memory, it is the models that have digital climate with the variable fan speed, not the ones with the basic fan switch. The resistor is commonly known as the hedgehog. It’s another possibility, usually fails on the E46 but can do in the E36 too.
JohnW
2008 B3 BiTurbo Coupe #161 2011
Previous: D3 BiTurbo Saloon #373, 2009 M3 DCT Coupe, 2008 B3 BiTurbo Coupe #074, 2009 E82 123d Coupe, 2006 E92 325i Coupe, 2002 E46 325iSE Coupe, 1998 E36 318iSE Saloon

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Charles
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Re: B3 E36 Battery Bad Drain (Parasitic)

Post by Charles » Fri May 27, 2022 8:29 am

JohnW wrote:
Fri May 27, 2022 12:10 am
Sometimes the fan speed control resistor goes faulty and activates when not in use. There are two different types from memory, it is the models that have digital climate with the variable fan speed, not the ones with the basic fan switch. The resistor is commonly known as the hedgehog. It’s another possibility, usually fails on the E46 but can do in the E36 too.
This!

If the hedgehog is failing then you may notice unusual fan speed behaviour which is normally the first indicator of a problem. Unfortunately it is a PITA to get at via the drivers side footwell, unless you are a contortionist with small hands. Fortunately it is a cheap fix.
Charles
Teacher of Chemistry and driver of ALPINAs - not necessarily in that order ;)
B3S Touring (49/116) - been to the moon and now on the way back!
Renault Grand Espace - not mine but the wife's!

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