Need some help. When I bought my jeep the guy had a small *** battery in it but it would fire up everytime. So I installed my mc style lights and the next day the battery was dead. Switch wasn't left on or anything. So I figures screw it and bought the correcT battery. Well today we goto fire it up to load on trailer for a weekend of mudding and it's dead. What would cause the battery to be draining. Oh and I didn't have the terminals hooked up either because I had a feeling it was draining power. Fix???

 

Just so I have this right, you are saying that the second battery which was correct size and brand new, went dead in your Jeep without the main battery terminals connected? If that is the case, that battery could only have been bad from the parts store shelf and you need to return it for your money or a good battery. In the case of the first battery going dead after you installed your lights, check all of your wiring and any relays. You have got a short somewhere that is slowly draining your battery overnight.

 

yeah somehow the battery went dead. guess i need to retrace the lines

 

charge bat to full get a 12v test light remove the neg bat cable leave pos attached take the clamp en of test light and clamp to neg bat terminal attach the other end of test light to neg cabje you willk get a bright light if you have a draw the memoru in radio for clock and preset or any alarms will show dim light shut the doors if its brigh remove on fuse at a time shut door check test light when door is shut and light is dim the draw is in the circut fuse came from if you have a under hood light disconnect it first thing i would check is power to new light you installed