Question about 2003 Chevrolet Silverado 1500

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40 amp fuse how do u tell if thei good or not

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If the fuse strip inside is broken, it is bad. Sometimes hard to tell visually, so if you have a test light, you can probe both ends of fuse with key on. Ground the test light to a metal piece, and use the probe end to touch the metal at each end of the top of fuse. With key on, both ends of fuse should light the tester. If only one end of fuse lights the tester, the fuse is blown.

Posted on Jan 23, 2013

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It will help if you can identify the 40 Amp fuse that is being toasted when the key is turned.

I looked briefly at a fusebox diagram and found 3 circuits protected by a 40 Amp fuse. The Lamp circuit protects several circuits which have smaller rated fuses on each separate wire. The 40 Amp protection seems to be a safeguard if all the smaller circuits are active in total. Turning off the automatic headlights, should reduce power drain.

The next circuit is the Rear window defroster. Can easily pull 40 Amps, but once the 40 Amp fuse breaks, it should have no effect on the engine.

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I have a 2006 Ford Explorer. The wrench light (powertrain) comes on periodically, and the truck will no go beyond 40 miles for 3-4 minutes. What is the porblem


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The wrench light reports issues that the normal check engine light doesn't and you may need the dealer to read those codes with thei special equipment.

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I Have a 91 ford probe and The heater won't turn on I can't figure out why everytime I turn it on the fan don't come on and I'm not sure if it's the switch a fuse or the fan I can only find one fuse that...


The main fuse block located under the hood for the 1991 ford probe shows 13 fuses. There is a fuse that contros the heating, AC & Programmed ride control system. It is a 40 amp fuse and has a blue wire.the color code for a 40 amp fuse is green.

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1 Answer

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make sure of two things one is any wires touching at the starter to ground or melted and or is the starter drawing too much amperage causing the fuse to blow.starter may have a dead short in it.

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A fuse that is consistently blowing is telling you that there is a short in that system. Don't attempt to bridge it or use a larger amp fuse or you will have a major problem. You will need to start tracing wiring to destinations to find the short. If while moving harnesses around problem ceases to exist, look at nearby items where you are working and try to locate what was grounding. Sometimes people will stop if short disappears, leaving open the possibility of it happening again.
If you are not comfortable working with wiring, then leave it to professionals who do this every day. It's not really difficult but requires patience and a good bit of knowledge to do this right!

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