Misty Taylor

I replaced the alternator and battery and everything runs great until I turn on the headlights and it kills my battery instantly....the car will run all day great but as soon as the headlights come on I have to jump it off...any suggestions?

thisguyaves

Major short in the headlight relay? That's a weird one

Misty Taylor

I looked into it but the lights work they just kill the battery...

bare

Put a meter on the Battery as you turn on the lights To see just How much power is being sucked by the headlights.
Also have the battery load tested Yeah a pain.
But It's possible ! even if it seems unlikely to you.... that the Battery is Pre broken/Dead.

Servando Deleon

Misty did you figure it out what was the problem with the headlights killing your because mine does it to exactly like your situation...

benchwarmer

What about the switch ? I mean you can hot wire a headlight onto the batt. and it'll only draw so much current , my chime is broke and I leave my headlights on for awhile with no problems . If the problem started after you changed the alt. and batt. then that's where the problem lies I would think .