If there are small wires on your positive connection to the battery - give them a good tug - for that matter, give all the wires in the primary wiring system a tug - All the wires that are big, or go to the starter should be pulled upon. Pull them so that they do not short out if they come apart.
You cannot pull a good wire or its connection apart. Do you have any generic crimp connections under the hood? Any taped connections - I had a taped connection in my '54 Chevy that had no connectors, just twisted wires.
I have had two wires in Volvos corrode down to one strand - One off the positive battery connection, and one to a headlight.
Look up auto primary wiring voltage drop testing or some such.
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