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Q:

what makes a warm up light work on 1995 Ford F-250

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
the light will not come on and it will not start does anyone have any suggestions on how to fix this problem
(1) Answer
Sounds like you have a glow plug problem - either a glow plug wiring harness issue or a controller issue. Could be glow plugs themselves, but if the light is not proving out, then I suspect something more controlling than the end glow plug.