Originally Posted by
Reevz1977
Thanks so much folks - how do I know if it's the battery, is there any easy test?
Yes, static with everything off measure across battery terminals, should be minimum 11.6 volts ( give or take ).
When running, 13.8 to 14.3 volts. ( yes, I know it won't start, but thought I'd tell you anyway )
I agree with mrmiata, probably the RCM.