300tdi Alternator

I have just bought and fitted a reconditioned alternator on my Discovery.
The manual states that I should be getting anything from 13.6 to 14.6 volts when the car is running and loaded with headlights, rear screen etc.

My new alternator is only managing 13.58 when not loaded and 12.6 when loaded.

Anyone any thoughts whether this is OK?????????????????

What rpm was the engine doing when you measured the voltage?

I'm no expert but if measured at tickover, I'd say that was pretty good.

Stickybackbob said:

What rpm was the engine doing when you measured the voltage?

I'm no expert but if measured at tickover, I'd say that was pretty good.

Click to expand...

The first reading was at 800 rpm and the second was at 1200

It looks like your are losing a volt, it should remain roughly between 13.6 and 14.4 what ever the load and revs it's the current that is varable.. Are you doing your test with a good multimeter ie a Fluke as some meters give readings that are + or - 10% so that would show a voltage of 12.4 at 13.6 volts straight away.

I have a recon alternator in my other car and that only gives 12.8 no more no less and I havent had any problem sofar. If I had known at the time I may have gone back to the shop for a replacement.

Regards

It probably putting the charge back in your battery. Take it out for a decent run then measure again.