RE: Battery

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As big as you can fit
more important is that your altanator has enough oemph to charge the battery you can put an 65 amph in your car but when your dynamo only delivers 45 amph it has a good change that the battery won't fill properly.

so check out what kind of altanator you've got and then decide which battery

Another option is to get an 55/65/85 amph altanator off an e21/e30 with m10 block and upgrade your powersupply, it's real easy

-Disconnect Battery

-Remove stock 45 AMP Alternator
– Remove 3 prong wiring harness and the 10mm bolt that holds the red wire. Remove bottom 13mm nut and bolt from the tensioning arm. Remove the top 13mm bolt. Remove Alternator, and list it on fleaBay (RARE! Original! BMW Alternator! ;)).

-Remove the square voltage regulator located next to the relays on the drive side engine compartment.

-The 320i alternator is internally regulated, so 2 wires only need to be hooked up. The wiring is very easy. The thick red wire goes back on the 320i alternator, on the "B+" post – this wire does the charging. Cut the BLUE wire off the stock 3 prong harness and connect it to the "D+" terminal on the alternator.

-Hook up the ground wire (brown) just like it was on your stock alternator
 
-Bolt up 320i alternator in the reverse of the removal procedure of the stock one.

-Tighten the fan belt just enough so that you can take the belt between the water pump pulley and the alternator pulley and twist it 180deg. Don't overtighten it because you will kill the water pump bearings. If it squeaks under load (when lights, etc., are on), snug it up a little more.

-Enjoy brighter lights and fewer charging problems! Take her for a night drive! :)

source www.2002faq.com

greetz
Guido
dutch 02 club