You know, when my problem, 100% exactly like this started, I changed the negative battery cable with a generic replacement without the secondary connection, )knowing the cable and secondary connection were bad and not thinking the secondary connection was important). But before I changed it I had this problem, it wouldn't even run, so now I bet if I clean up my rotted old cable, and re-tap the battery holder and connect it it should fix my problems, and run again. you helped me a lot, thank you!