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Q:

running lights on 1990 Ford E-150

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
my running lights quit need help on where to look first
(1) Answer
If you want to diagnose this, start by checking the fuse. If that's OK, then you'll want to get a wiring diagram and perform an electrical circuit diagnosis to determine the problem. You can find the diagram here: http://bit.ly/mitchell_repair_manuals_online