Slow crank

AJ/FormS said

IMO, if you have only one cable going to the front, the problem will be in the connection to ground, probably at the back. I had to make a bare connection to the frame back there, and clamped the ground to the frame with a new 3/8" bolt; problem solved; same at the front, then painted over them to seal the connections. That was in about year 2000; so far no more problems.

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WAAAAAAAyyyyyyyyyyyyback in the old days when I had the 70 440-6 RR I trunk mounted the battery. I had "obtained" some nice silver plated teflon insulated cable to the front. Added a big "6 volt" eye-to-eye "starter" cable from the block to a bolt through the front frame stub. Grounded the battery in the trunk to the floor. Another thing that helps high current body grounding terminals is to scare up such as Burndy terminals with the two eyelets in the terminals



Bear in mind this was back when NO PM (Dakota mini) starters. That big 10.5 ***** always cranked just fine. It did not have a lot of overlap so it had a fair amount of cranking compression.

Nowadays many advocate a separate ground strap, which is likely better for electronics (EMI/ RFI etc)