Forum Discussion
ksg5000
Aug 20, 2018Explorer II
simonov wrote:
Any ideas why the car will only start when the house battery is fully charged? Maybe the auxiliary start switch is jammed?
It's possible that the battery isolator solenoid is stuck - they tend to fail and maybe yours failed when closed. Suggest you check your battery cables and grounds. Also - note that Ford stuck another relay/solenoid between the chassis battery and the starter. It sits up front next to the radiator in front of the chassis battery -- worth a look/test.
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