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2004 mustang v6 large battery draw narrowed so far down to a large 30A fuse #2 in engine comprt
fuse marked headlights pulled it gets rid of draw but not sure why or ware
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Answers
To diagnose further, see what happens if you unplug each headlight one at a time, then both.
If problem continues with both headlight plugs unplugged at the headlight-end, an ohm-meter can be used to identify which wire is shorted to ground. With headlight switch pulled slightly from dashed and in the "on" possition, touch one ohm-meter probe to the headlight power lead(s), and the other end to chassis/ground.
That should identify which headlight power wire is offending/shorted, if any (the one that pegs the ohm-meter showing short-to-ground is the offender).
If you disconnect fuses 4 (10amp), 10 (10amp), 38(20amp) in the smart junction box under the left side of the dash does that have any effect? (pull them one at a time and check)