Mick,
I bought one of these for my spares - http://cgi.ebay.com.au/24V-to-12V-DC...item3cab92e91c
just in case I need to put something that is 12v in the truck in an emergency to run off 24v. You could use one to run your pump if the original suppressor is broke.
They push out 30A and are cheap.
My electrics are a nightmare with a lot of the insulation breaking down on the wiring and corrosion in the terminals so expect ongoing electrical issues - but unlike Ron I can normally use the handbook to trace wiring issues.
Garry

