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MarkS · 9th January 2020, 18:40

The following does NOT apply to diesels.

Make sure the engine is NOT running.

Remove the 150A (alternator) fuse in the engine fusebox.
Put a 10A DC ammeter (& a 10A fuse in series if possible) in the 150A fuse circuit. Be very very careful to not drop probes or let wires short to the chassis.
(With the engine still NOT running), any leakage due to diode failure will show up on the ammeter.

Do NOT try to start the car without reinstalling the 150A fuse, otherwise the alternator may be damaged.

Finally, if you are not sure what you are doing, take advice or don't do it. 12V lead acid batteries, ammeters and not enough knowledge generally leads to sparks, melted wires, damaged meters and blown fuses. Ammeters can be very dangerous if misused.

9th January 2020, 18:40	#3
MarkS Gets stuck in Rover 75 Diesel Tourer, called Perseverance Join Date: Nov 2011 Location: Bournemouth Posts: 664 Thanks: 189 Thanked 157 Times in 108 Posts	The following does NOT apply to diesels. Make sure the engine is NOT running. Remove the 150A (alternator) fuse in the engine fusebox. Put a 10A DC ammeter (& a 10A fuse in series if possible) in the 150A fuse circuit. Be very very careful to not drop probes or let wires short to the chassis. (With the engine still NOT running), any leakage due to diode failure will show up on the ammeter. Do NOT try to start the car without reinstalling the 150A fuse, otherwise the alternator may be damaged. Finally, if you are not sure what you are doing, take advice or don't do it. 12V lead acid batteries, ammeters and not enough knowledge generally leads to sparks, melted wires, damaged meters and blown fuses. Ammeters can be very dangerous if misused. Last edited by MarkS; 9th January 2020 at 20:06.. Reason: Finally.....