Slow Crank, No Start When Warm

RustyRatRod said

Then get a remote starter switch. Any auto parts store will have one cheap.

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THIS. You MUST test under load "cranking." That is the way voltage drop works. If you can't measure the battery in the trunk by yourself, "rig" some wire from the meter up front to the battery. Use your head. You can use an extension cord, EG example: Get an extension long enough to reach front to rear. Voltage drop in that cord is not an issue because all it is powering is the meter measurement. Now pick a ratty short lamp extension, and cut it in half. Connect that extention, "plug" in to your long cord. Strip the cut ends, hook one of the cut ends to your meter, and clip the other end to the battery.

Yet another way is to do the opposite. Use your meter back at the battery, but use the extension cord lash up to trigger the starter relay. Hook one wire of one end of your cut end to the batter, hook the other wire to the spade on the starter relay where the yellow "start" wire goes. Just short the other end of the ext. cord together at the rear to crank.