P38A Furry stuff...

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If you're only getting 13.7 then the battery is probably dragging it down and needs a good overnight charge. A newish alternator should ideally be set to 14.7

Sulphation refers to the internals, not the crust on the outside ;)
I'll go take it off NOW, before I run out of energy and charge it overnight, until I go to see the delighful Sandra tomorrow lunchtime.
 
Regulators can't be adjusted.

Start the engine and then disconnect the + from the battery and measure the voltage between the + wire (in your hand) and the - terminal on the battery.
Also measure the voltage between the + wire and the chassis (bare metal in the battery box will do).
Measure the voltage between the + wire and the engine (you will need a long bit of wire).

All three readings should be the same, between 14.2V and 14.7V (you may need someone to lift the revs above tickover to get above 14V)
Reconnect the battery and read the voltage across the + to - terminal.
It should be the same.
If it drops there is a problem with the battery.
If the voltages are different between the chassis and the engine and the terminals you possibly have an 'earth' fault, (chassis to gearbox or chassis to battery).

White fur .... https://mechanics.stackexchange.com...e-powder-forming-on-battery-hold-down-bracket
 
Regulators can't be adjusted.

Start the engine and then disconnect the + from the battery and measure the voltage between the + wire (in your hand) and the - terminal on the battery.
Also measure the voltage between the + wire and the chassis (bare metal in the battery box will do).
Measure the voltage between the + wire and the engine (you will need a long bit of wire).

All three readings should be the same, between 14.2V and 14.7V (you may need someone to lift the revs above tickover to get above 14V)
Reconnect the battery and read the voltage across the + to - terminal.
It should be the same.
If it drops there is a problem with the battery.
If the voltages are different between the chassis and the engine and the terminals you possibly have an 'earth' fault, (chassis to gearbox or chassis to battery).

White fur .... https://mechanics.stackexchange.com...e-powder-forming-on-battery-hold-down-bracket
Excellent tips! Cheers!
 
I changed the alternator recently. When I jump started this morning, it was pushing out 13.7v at tickover.
With a partially discharged battery, you should see 14.7 volts even at idle once the alternator starts to charge. You could drive a couple of hundred miles non stop and at 13.7 volts the battery would not fully charge.
For the diesel, the regulator you need is:-
Mobiletron VR-VW010 Less than £15 on Ebay easy job to swap, better done with the alternator off the car.
 
Enough to make things a bit hot at full load.
I think the car takes~45A just to run at idle.. turn on all the toys, not so much left for the battery :(

Never actually measured, be interesting to see though
Heated screens front and rear
Heated seats
Heated door mirrors
Cabin heater blower motors
Headlights
Radio, subwoofer
Air compressor for a few mins at a time
Everything else like windows, seats, brake pump etc are very brief
Have i missed anything?
 
I think the car takes~45A just to run at idle.. turn on all the toys, not so much left for the battery :(

Never actually measured, be interesting to see though
Heated screens front and rear
Heated seats
Heated door mirrors
Cabin heater blower motors
Headlights
Radio, subwoofer
Air compressor for a few mins at a time
Everything else like windows, seats, brake pump etc are very brief
Have i missed anything?
100 amps is not much?
 
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