Alternator upgrade

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kleever

kleever

New Member
Posts
38
Hi

I was wondering if you guys have the answer.
Ive looked at the various threads about alternator upgrades but nobody has give any parts numbers. im in the process of rewiring my series 3. and thought its the ideal time to change to upgrate the alternator as mine is only just hanging on. I dont want to cut into my brand new loom so or do any mods so was looking for a direct swap out.

Any help with this would be great.

Ive read to many online threads and am getting confused lol:confused:
 
It would help to know what you're upgrading from and how much extra capacity you need.....
 
I fitted an 80A from a Range Rover V8i...tenner from a scrap yard...fits fine with a little bracketry adjustment and I can run the stadnard size LR belt. I beefed up the wiring as a matter of course.
 
Somewhat new to this as just acquired a Series IIa. Fitted with basic 16ACR (why upgraded to this from the original dynamo rather than something beefier at the time ??) so was considering the upgrade to something more substantial.

As we live in the country in Northern Scotland, infrequent use and long nights require a decent charge rate over short journeys.

What action has been taken to revise the ammeter, Full scale is around 30 amps. 80 amps is the maximum for the LMA653.

Any ideas on the results on the meter?
 
The ammeter is usually wired between the battery and the alternator after the live feed to the rest of the car so it's only measuring the current going in and out of the battery (not including the starter motor current) so it's not reading the alternator current. You're not likely to get more than 30A going into the battery to charge it.
 
Its personal opinion but I dont approve of ammeters, they add a degree of unreliability and the wiring causes volt drop, 0.1v affects the charge of the battery quite a bit.
This is avoided if you have an expensive ammeter with a remote shunt.

I think a voltmeter is a better idea, more reliable and if used correctly can tell you more.

If you really want a ammeter you can get higher capacity ones, prestolite do one that goes to 125 amps + and -.

I've seen installations where a split charge system is in use and charge currents well in excess of 100 amps have been typical.
 
Last edited:
Thanks for the response, being an exRAF 109, the ammeter is built into the left dial so not an extra! Will have to think about rewiring or removing!
 
Not sure if that would work, the 90 would appear to be a round dial that drops into a faceplate. The IIa has it built in to the Left dial along with the fuel gauge and main beam lamp
 
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