The 75 and ZT Owners Club Forums - View Single Post - Voltage drop test for parasitic battery drain

MarkS · 17th March 2021, 21:25

This was how I was going to address the problem.

https://www.the75andztclub.co.uk/for...d.php?t=303962

But I can't find anybody who knows how to drive it in software, nor a Rolls Royce Phantom, that I can fiddle with (legally anyway)

The problem with the voltage drop method is that with a shunt value of 1milliohm, a discharge current of 10mA would give a voltage drop of 10uV, which cannot be resolved with a 3.5 digit 200mV digital multimeter.

Hence use the BMW part, which has been designed to do exactly what we want.

17th March 2021, 21:25	#8
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	This was how I was going to address the problem. https://www.the75andztclub.co.uk/for...d.php?t=303962 But I can't find anybody who knows how to drive it in software, nor a Rolls Royce Phantom, that I can fiddle with (legally anyway) The problem with the voltage drop method is that with a shunt value of 1milliohm, a discharge current of 10mA would give a voltage drop of 10uV, which cannot be resolved with a 3.5 digit 200mV digital multimeter. Hence use the BMW part, which has been designed to do exactly what we want. Last edited by MarkS; 17th March 2021 at 22:15..