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Q: electrical on 1999 Ford E-250

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
if i read 12volts between the negative cable and negative post does that mean i have a short in the system i was told it should be about 6volts
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start pulling fuses and watch the guage,when it drops then you'll have an better idea where the short is.i would start with the cigarette lighter fuse,sometimes those sockets go bad and draw voltage.then the fuel pump relay would be my second choice.