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40 amp fuse blows in accessory position-where do I start?

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2007 ford freestar will fuse # 40 in the underhood fuse panel when the key is turned to the run/start position. It would blow before when it was running and cause vehicle not to shift. Had the transmission...


Any applicable trouble codes? Several systems get voltage off that same fuse. oxygen sensors-- canister purge solenoid--ac compressor relay--imrc, intake manifold runner control, has to do with induction-- breathing. And tranny control.
If it blows as soon as the key is turned on, maybe you can narrow it down by unplugging each system one at a time? That may not be conclusive, any system you unplug, there will be less amp draw on the fuse. Just a thought.

Jul 24, 2017 | Ford Cars & Trucks

2 Answers

My 40 amp main fuse blows every time I plug it in. Cannot find a short or bad connection between the battery and the fuse. Not sure what the problem is.


The short will have to be after the fuse. It would help to have a schematic to help trace the wires. Wire shorts are hard to find. See if you can get a manual for the car before you start.
Does it blow the fuse even with the key turned off? If so it could be the cigar lighter wiring.
Send us the make & model of the car and we might be able to find a schematic.
Hope this helps.

Jan 31, 2015 | Cars & Trucks

3 Answers

I have an 86 dodge d100, 318. When the vehicle is running, I pull the lever for the headlights, and the fuseable link from the positive battery post to the alternato blows. I have a 40 amp fuse in the...


you have a dead short in head lt wiring. try un plugging one head lt at bulb at a time. if continues to blow fuse inspect wiring in cicuit for any bare wire too frame.

Dec 04, 2014 | Cars & Trucks

1 Answer

Blowing 40 amp fuse when trying to start


check that the small wire on the solenoid is not touching the big terminal on the starter solenoid or is not shorting out any where .

Apr 22, 2014 | 1991 Dodge Dakota

1 Answer

1995 Mercury Grand Marquis blowing 40 amp fuse as soon as I turn on ignition


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.

The last circuit, on the cars with Trailer Tow or Police package has a
40 Amp fuse on the Battery charge Relay. This is a remote possibility. But the engine should be able to run without an Alternator for several minutes using Battery power.

Have them check the fuel pressure. The Inertia switch could have tripped while the car was being repaired. It does not explain the wiring short, but can explain the no start condition.

Again, if the same 40 Amp circuit is overloading, identify the circuit with the fuse box diagram.

Feb 18, 2014 | 1995 Mercury Grand Marquis

1 Answer

2011 honda pilot accessory port failure


remove what.

i bet you didnt know there are 2 fuse boxes.

check all fuses in both boxes.

or read the drawings on alldata.com

see what fuse powers this acc. port.

the inverters suck big current and will blow a power port in jiffy

(read amps on inverter, and see, wow huge)

1000w is 83+ amps.

500w is 40 amps. both are fuse killers.

fuse that look bad are

fuses that look good, can in fact be bad, hair line cracks

use any ohm meter on low scale, 0ohms good. infinity bad.

to test any fuse.

Jan 10, 2014 | 2011 Honda Pilot

1 Answer

40 amp ignition fuse keeps blowing


U have a positive wire making ground

Jul 30, 2012 | Jeep Cherokee Cars & Trucks

2 Answers

2002 tahoe blowing 40amp large fuses in fuse block under the hood


You have a short in that wiring, most likely related to your starting motor. Pull the starter relay (in the underhood fuse box) and try a new fuse to see if that is the case. If so you will need to have the motor checked. If not, there are a variety of systems that use this feed via the ignition switch and each will have to be checked (including the switch). If you need a wiring diagram, try Alldatadiy.com.

Feb 01, 2018 | Chevrolet Cars & Trucks

1 Answer

My 89 geo tracker blows the 40 amp fuse


You will need to trace the wire to find the short that is blowing the fuse. It can be in the harness somewhere. Usually the harness will be rubbing against the frame parts until it gets to the bare wire. It does take years to get that far

Mar 07, 2010 | 1989 Geo Tracker

1 Answer

1999 Chevy Venture 40 amp fuse keeps blowing when I try to start the van. This happened on three seperate days. I drove 150 miles and stopped the van. The could not start the van again. When I try to...


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.

Aug 16, 2009 | 1999 Chevrolet Venture

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