I want to upgrade the alternator in my R12 from the standard 35 amp unit to something that'd s bit more able to cope. In theory, 35 amps should be plenty but those 35 amps only appear at something like 3000 RPM and the unit isn't within a bull's roar of this at say, 800 RPM idle.
Even with the original feeble 40/45W light globes the battery meter barely stays in the green at idle. On a rainy night with lights, wipers and demister fan running she's well into the red at idle. Don't have a sound system or electric radiator fan so it's a bare-bones set up and it's only called-upon for the essentials. I know the accuracy of the meters is not fantastic but it should be close.
Anyway, are there any higher capacity alternators that bolt up to the original alternator mount (engine side)?
I have tried a Bosch 85 amp alternator from a Magna. It's got the mounting holes at 180 degrees and is only marginally bigger than the original (the outer side bracket doesn't need to be moved out too far so doesn't foul the chassis) so looked suitable. Problem is that it's set about 14mm further back than the R12 alternator. The mounts are moulded into the aluminium casing of the alternator so they can't be moved so I can't simply pack it out with spacers. Moving the mounting bracket forward with an adaptor plate is a problem because it then fouls the no.4 plug. I could possibly make up a custom mounting bracket but I'd rather use the original mounts if possible and if there's a bolt-up alternative I'd rather try that first.
I'd like to stick with a Bosch unit if possible. They may not be the best but parts are relatively easy to get and there are heaps of them around in other Aussie built cars so they're easy to find and cheap.
I'm not concerned with the wiring, I'm sure that can be sorted without any difficulty.
I expect someone has gone down this road before and I don't want to re-invent the wheel.