In Reply to: Slow cranker posted by Tom on February 04, 2018 at 18:56:58:
It sounds like a weak battery or bad wiring to me but don't guess -get them checked out. What's a 'jumper pack'? I'd start with the battery. A 'fresh' battery means nothing -definition also needed. Even some new ones are bad, and bargain house brands have poor lifespans. Get the battery checked at a trusty, local starter/alternator shop. It must withstand a charge under load and they have the test equipment to verify the condition. There usually is no charge (no pun intended) to test it. The next issue I'd check is the wiring. You say it is a 12-volt conversion. There is nothing wrong with that, but many 12-volt conversions are done improperly. New battery cables are fine if they are the 12-volt gauge class. You can use JMOR's wiring pictograms to get an idea of how the wiring should be connected -look at the NAA sketches for reference. I'd look into these issues first before pulling the starter. Your trusty shop guy can also test the alternator and starter too.