>Changed alternator >Changed battery >Start driving

>>17753798
Bad relay(s).

>>17753806
The fuses?

I haven't thought about that being an issue...

>>17753798

start checking wiring and cleaning grounds. if its a Ford or Nissan, might have gotten a fucked reman alternator. when i worked in a shop over half the reman alternators for Nissans and Fords we got from fucking Napa were bad right out of the box

get a voltmeter and throw it on your battery, should be 13.9-14.4ish volts. otherwise you got a fucked alt or wiring issues

loose battery terminal

>>17753798
Start pulling fuses till the problem goes away. When it does, you've found where the drain is.

>>17753828

if he had a drain the battery would be dead after the car sits, drain doesnt matter when the cars running since the alternator is charging the battery. drain with a running engine is no different than charging your phone or having headlights on

>>17753798
Reman alternators can fail instantly sometimes

also check all your main battery/alternator/startor/solenoid connections

check your battery connections and ground straps