Just bought my car brought it home it sat for a few days.......went to start it and it was dead! Battery is brand new any suggestions? If I do have an unwanted draw on the battery how do I check it out? Is there a light that might be on that I don't know about? Thanks for any and all help!
Gen 1 headlights have proven to be a battery killer. You did not say what year you have but if it's pre 87 - raise your lights - disconnect the motors so they don't close (watch your fingers when in that area) charge the battery and then check in a couple of days. If it starts the motors are your problem.
The best way to measure current draw is to use a multimeter with an ammeter setting. (Read the multimeter directions very carefully before hooking up for current since it goes inline with the power connection). Basically, you disconnect the positive cable from the battery. Set your multimeter to the highest amp setting (you can move it down to lower settings after) and make sure the leads are in the correct holes of the meter. Then hook one lead to the positive cable and the other lead to the positive terminal of the battery to complete the circuit. You should read about 20mA, which is the draw associated with the ECM. If it is substantially more than that then you have a parasitic drain. (If the draw is still only 20mA and your battery is going dead, then it is a bad battery). You can trouble shoot by removing fuses one at a time until the drain disappears, which ever fuse you last pulled indicates the circuit with a fault. That is your starting point. Another common problem failure is the oil pressure switch (on the block, bypassing the fuel pump relay). Occasionally this fails to ground and causes a drain...or a fire.