On Sat, 30 May 2020 09:53:06 +0100, T i m wrote:

On Sat, 30 May 2020 08:22:22 -0000 (UTC), Smolley wrote:

snip

This morning after the engine fan had stopped I measured the standing
current across the open knife switch and was surprised to see the meter
was reading 3.26 amps. No wonder the battery flat!

How long did you leave it measuring for? When you connect the ammeter
you are effectively re making the circuit and it will then go though any
diagnostics etc until it goes into sleep mode.

Cheers, T i m

The meter was connected across the knife switch before the circuit was
opened, so it shouldn't have seen any break in supply.