Doesn't seem to charge. Now. I ordered this for my '67 Mustang 302 with engine about a month ago. I had to drill to make the top hole bigger and needed more clearance from the motor, but it worked. Upgraded my charging cables to 2 gauge. Went to the auto zone to check the charging system and everything seemed fine with all my loads (lights, electric fan, air conditioning, stereo with the subwoofer on etc.), the charge was still good. It's been about a month or two before I can tell if it keepsβ¦