I have a 2005 Frieghtliner that worked good all fall.
Put it away after harvest, turned off master switch.
Went io start it last week, everything went fine when turned switch on,
dash lit up as usual. Turned key to start it and dash goes dark and doesn't turn over.
When let up on key the dash lights up again.
The batteries test good. It seems to me it would be a bad connection somewhere.
I am wondering where to start looking.
Any ideas?

Thanks