ignition fuse

1998 CHEVROLET SILVERADO
200,000 MILES • 2WD • AUTOMATIC
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BRAMBLETT
  • MEMBER
  • 1 POST
when i go to start my truck it cranks and automatically blows ignition fuse if i turn key over again radio comes on but nothing on the dash. i replaced fuse and it instantly blew as soon as i started the truck again.
Dec 21, 2017 at 7:11 AM
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CARADIODOC
  • ✓Experienced Mechanic
  • 34,406 POSTS
A simple trick to finding a short is to replace the blown fuse with a pair of spade terminals, then use small jumper wires to connect them to a twelve volt light bulb. A brake light bulb works well. When the circuit is live and the short is present, the bulb will be full brightness and hot so be sure it is not laying on the carpet or against a plastic door panel. Now you can unplug electrical connectors and move things around to see what makes the short go away. When it does, the bulb will get dim or go out.
Dec 21, 2017 at 8:33 AM
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