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Everytime I turn on the rear window defroster it blows

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  • Cars & Trucks Master
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Check for a bared wire after the fuse or a dead short before the demister.

Posted on Apr 22, 2014

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Posted on Jan 02, 2017

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SOURCE: Rear defroster fuse keeps blowing

Get you some rin foil and put on the fuse and plug it back in. Where ever the short is. It will start smoking. So becareful and keep yours eyes open for smoke or burning. You will darn sure find the problem.

Good Luck.

Posted on Feb 02, 2009

BPALepine
  • 61 Answers

SOURCE: horn,headlights and rear defroster are all malfunctioning

Check the wiring, it sounds like a wire grounded out which makes the wire get hot and melt the insulation off of the wire and then melts into the surrounding wires. Which in turn the exposed wires make contact and can do all sorts of things depending on the wires involved.. in your case when you turn on the headlights it feeds power to the rear def. and the horn.

Posted on Apr 20, 2009

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1 Answer

Horn,headlights and rear defroster are all malfunctioning


Check the wiring, it sounds like a wire grounded out which makes the wire get hot and melt the insulation off of the wire and then melts into the surrounding wires. Which in turn the exposed wires make contact and can do all sorts of things depending on the wires involved.. in your case when you turn on the headlights it feeds power to the rear def. and the horn.

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If the radio is aftermarket, they cross the circuitry of the antenna near the defroster, causing static in the antenna everytime you turn it on. Disassemble the radio and check for the wiring. Worst case scenario: they used the Positive wiring for the defogger switch and connected a wire to the radio's ACC cable.

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