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'03 Turbo blows ignition fuses

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Old 27 Oct 2013, 06:55 pm
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Question '03 Turbo blows ignition fuses

Have an 03 turbo cruiser automatic with 120k+ that keeps blowing ignition fuses randomly. First did this a couple months ago. Replaced fuse after some troubleshooting and it had been fine since until today. Stopped to get gas and went to start engine, heard a pop and nothing. Anything that works with constant power works fine. But had no dash lights, radio etc. Checked fuses again and the ignition fuse was blown. Replaced it, engine started and everything was back to normal. Shut engine off to put everything back together, tried to start it and the fuse blew again. Any ideas what is causing this??
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Old 27 Oct 2013, 07:35 pm
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Default Re: '03 Turbo blows ignition fuses

Ugh this is just a WAG, but maybe the ignition switch itself?
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Old 28 Oct 2013, 01:30 am
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Default Re: '03 Turbo blows ignition fuses

You have a short to ground. Whenever the circuit is bridged to a ground in front of the load (B+) side, it basically removes the resistance in the circuit. If we look at one of Kirchoffs laws it says, as resistance goes down amperage goes up. As amperage increases, it begins to get hot and will melt the fuse. You can change the ignition switch, or look up a test procedure for it. If that does not work, you need to print a schematic and bust out a DMM.
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blown fuse, ignition

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