There seems to be a short in the positive battery cable
Frequently my van will not turn over due to what seems to be a short in the
cables going too the positive terminal. We discovered that if you wiggle the
cable it would start. Not it is happening more frequently and sometimes won't
start at all. As my only vehicle, it has become very unreliable
If it's a short you would be draining the battery, if it's an 'open,' you lose continuity in the connection. If the break or open is near or at the terminal, replace the terminal. Otherwise after finding just where the problem area is you'll have to repair it or replace that portion of the wiring harness. Sets of positive or negative battery cables are not too expensive.
Make sure the battery posts and cable ends are clean, that black corrosion can reak havoc with voltage supplies from the battery, also feel and bend the cables, if they make a crunching sound it is time to replace them as the corrosion has already got inside and there's no recovering from that.
Could be the connection or it could also be that the battery post is loose inside the battery. Loose post inside the battery requires new battery.
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