just wondering what will be the biggest amp alternator too put on my a12 and im running heaps of stuff off it and blew my old one any help will be apreciated Cheers Rick

Just run b Bosch one from a KC Laser, they bolt stright in and run about 55 Amps

Have u got one on ur car??

I've heard that a bosch alternator from a series 2 blubird fits and is 60 amp over the 1200s 35amp. Probably the same as the laser one. Anyway the series 2 bluebird i'm told will bolt straight on and the pulley will line up with the crankshaft pulley. Only thing is the wiring needs to be changed as I think the blubird alternator is internally regulated by any auto electrician should be able to do this easy.

I got 2 big 130 watt driving lights to put on my rally 1200 and will do this alternator conversion in a couple of weeks so I can run them!

According to my calculator, those two lights alone will suck about 20 amps, so by the time you add the two [nominal] 100 watt high beams, plus all the other lights, you will be drawing somwehere between 36 to about 42 amps with everything on.Turn on the aircon & the engine could be in trouble.

Don't turn them all on with the engine idling.

P.S. My steam powered calculator used a nominal 13v for its calc's

i have an 85....brand nu....with bracket slightli modded to fit...
was running the amp fine til it died....damnit!!

i have put 85 amp alternators on both style of a-series (alternator on driver or passenger side), it's pretty simple, i use an EA falcon alternator which can be picked up pretty cheap at a wrecker (there is 75 and 85 amp models but both are identical to mount and wire)

the install also allows you to remove a lot of wirring, i have posted the details on the conversion before, let me know which side your alternator is on and ill give you a run down if you like

Most Datsun alternators are at least 50 amps, for example, the 510/520/620 alternators bolt right into the A12 mount.

But why not fit a 100 amp alternator? Many of the larger fords and gms have these.

Its on the right side

I went for a v8 fairlane alt. not sure what amps but more likely 55/65? these v8 alt. have a really large pulley on them , this is good to slow down the axle speed of the alt , not like to over rev it now