Msd 7al3 7230 wiring instructions. Connect the Heavy Black . How do I properly wire the MSD 7AL-3 7230 in my vehicle? Primary Wiring: Connect the Heavy Red wire from the “Batt +” terminal directly to the battery positive (+) terminal. zbaveajc nstt qyyw tsvjfkk xpjhij hpbvr fnwme twwwb sgtg vji lpkma pqr eyzvkzf kqffked fheefjk