Outer Limits 4x4 Board

hey guys i just fitted my piranna dbe 180s dual battery kit sweet setup easy to install started her up an ffs my Alternator is only chargin at 12v an the dual battery kit wont start till 13.4v just wondeing if anyone knows what type of high output alternator i could get o fit a holen 308 in a rover

i have 2 700 cca 86ax/bx exide batters will be running 4 120w ipf roof lights in car sterio sub 4 speakers winch 8/9k low mount another 2 front mount lights an rear fridge

would i need any specific amp alt and or where can i get one as only ones i seen are the chrome 100amp ebay Alternators

Hi rusty, your cranking battery, when fully charged will have a voltage level of up to 12.8 volts, so are you sure you measured the voltage correctly because, no matter what type of alternator you have or how old it is, with a 12 volt output, your alternator is actually putting out a lower voltage than your cranking battery would have, just sitting there.

Any alternator would need to be putting out at least 13.8 volts or you are never going to charge any batteries, cranking or auxiliary.

Cheers.

yer i have led volt meters on both batterys an we check with a multimeter on teh alternation an it couldnt even hit 13v

A mate put a smaller diameter pulley on his rangie alternator
which increases rotation speed! which helps whilst at idle speed!
( it helped get some extra punch down low! )
Is the unit giving a full charge higher in the rev range?

cheers

My usual method is to grab a VP-ish commodore alternator (if it's to replace a single-foot mounting type alt) or an EA/EB falcon alternator (identical beast with a slightly different housing - two feet instead) and bolt one of those in.

Both are identical, reliable bosch units putting out 85A and about $30 from a wrecker, plus maybe $15 for a new brush pack if required, and both are easy to adapt to pretty much any motor.

For more than 85A you have to spend a fair bit more and for most practical cases I can't really see a good reason.

I have a thread on here somewhere fitting a falcon alternator to a G60 motor, and I have photos on my camera of fitting a commo alternator to a Rover V8 (which I haven't put in a thread yet).

yer i was thinking about that it is currently runnin a standard blu 308 hence currently havein a a commo alternator in it however i dont want to put in a second hand alternator as i have had problems with alternators b4 in my cars