ok so the battery in my e21 is pretty flat so i took the brand new battery i had in my e30 and tried to turn the car over and the starter just 'clicked'
is this the battery's fault?
battery advice
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Irish_chris
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Jeroen
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Re: battery advice
Bad ground cables in the engine bay indeed, engine to chassis on intake side and I believe head to firewall exhaust side. Also, do a turning session, you'll get used to that being an E21 owner: corroded contacts may cause fuses to fail or at least no let through enough current. Give your fuses a few turns to clean up, check relays. In the end, it could be bad wiring to the starter but I'd check in this order...
Regards/groeten, Jeroen