just put a new ls in my 94 civic eg6. My car already had the harness for a b18 in it. all i did was droped the new one in hokked up everything put new alt/batt. andchecked my fuzes everything came out right and now i can drive it for about 20mins and itll go frome 15volts to 8... pls help

How did your civic have a b18 harness in it? Bench test the new alternator, batteryand your starterat napa or someone like that. Something isdrainingyour power before it hitsthe fuses, nice choice on the b1