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Engine Fuse Keeps Blowing

If you are having fuses blow disconnect the battery and test the circuit for conductivity to the engine frame or body before you install the battery or fuse otherwise you are making tiny sparks exceeding 15amps at the ignition switch. If a relay burnt up it would most likely be an open connection unlikely to blow a fuse.


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Systematic troubleshooting procedures are needed along with a good.

Engine fuse keeps blowing. The car started just fine today after sitting for 2 days but after I shut it off the fuse blew again and it will not start. Engine 1 fuse keeps blowing when you turn the key. Check the MPI relay it provides power to the ECU fuel injectors and the fuel pump the fuse that keeps blowing on you is on the wire that provides the MPI relay with power to control these things.

A brake light bulb works well. Without it your car wont start but it will keep turning over. If the ECM fuse keeps blowing then there is a definite electrical short.

Conversely if the fuse fitted to the circuit is too small it will cause the fuse to blow below the circuits capacity. If I power the board with the pot down to min and keep it about there that means about 20V DC the fuse doesnt blow. We have a 2006 automatic 20 Focus with 38000 miles.

A fuse blowing is a sign of a bare wire touching metal. Like you said it does. This will help you to find shorts.

Recently it dies on the highway and the engine management fuse keeps blowing in the main fuse box under the hood. 2003 F-350 CC LB 2857516 Autometer Gages Fox 20s Thanks to Corey Sninister Bypass Coolant Filter 4 Turbo BackLeece-Neville 230 Amp Alternator 64 litre. That fuse runs most of the engine stuff including the ECU through the MFI relay so when it blows your engine will die.

Made multiple passes on 20 pounds without the fuse blowing. Fuse 22 controls your injection pressure regulator and also the brake pressure switch. The engine fuse keeps blowing when I try to start my 2000 chrysler town and country - Answered by a verified Chrysler Mechanic We use cookies to give you the best possible experience on our website.

Turn the boost down to 20 pounds made a complete pass and Didnt blow the fuse. Instead of trying to do the troubleshooting while someone is cranking the engine its easier to bypass the ASD relay with a stretched out paper clip. I replaced the ECu fuse try to make another pass and the same thing happened.

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 12 volt light bulb. The result is excessive heat burnt wiring or components. Im thinking the old motor binding up could have melted a wire to it and that wire is now bare somewhere along its path.

20 amp Engine fuse keeps blowing. You either have too many loads on that fuse or there is a short on one of its circuits. Checked all the fuses and found that the ECu fuse had blown.

For the case of where there has been a continuous blowing of the fuses it is important that you do a thorough check for the wiring connection to find. I had this same problem on a 98 chevy van 3500 and found the wire going to one of the oxygen sensors had shorted out on the heat shield. That occurs for one second after you turn on the ignition switch which is enough time for the fuse to blow.

Inspect the wires going to all of the oxygen sensors. The best tool y. The problem is the motor is disconnected along with everything else except for the pot and the chuck safety switch.

Engine 1 fuse powers the computer and some sensors. The relay might have developed a short or it could be something up the line from the relay. I went to purchased a couple and replaced the fuse.

When I turned on key once to the right the fuse would blow. Finding the source of a dead short that keeps blowing fuses can often be a real headache. Turn the boost up to 25lbs and same thing happened again.

You may want to disconnect them one at a time and see if that fixes the fuse from blowing. If the fuse does not blow it might be an easy fix because there was a power surge in the system. That relay doesnt turn on again until you crank the engine.

The important thing is to understand what is causing the fuse to keep blowing. Once off work I looked in the engine bay in the fuses and noticed that the 20 amp fuse with the little engine design had blown. That results in the fuse blowing every time the load is turned on.

Engine management fuse 30 amp keeps blowing hi all hope you are all well the 30 amp fuse to the engine management has started to blow not all the time but with annoying regularity the engine runs fine and for example my wife stopped at the petrol station tried to start and the fuse blew again any pointers or ideas where to start the car has been behaving perfectly flew thru its mot. If you want the procedure. The simple fix is often replacing the blown fuse and test the car again.

Jump to Latest Follow 1 - 11 of 11 Posts. In this video I run down my processes of find a short to ground on a 2005 Nissan Altima that keeps blowing the fuse for the throttle control. Fuse 27 in the passenger fuse box is a 20 amp fuse it is an ignition fuse in the power distribution box under the hood are s35 a 10 amp fuse is for runstart position of the key switch and 29 a 15amp fuse for the ignition and 30b is a starter relay take out this 30b relay and try to replace any blown fuses then turn the key onoffif you do not blow the fuses the starter relay may have gone bad or the starter solenoid maybe shorted but if you are blowing 14 10 amp fuse.

The fuse blows at zero load basically its the DC voltage increase that causes a short not the load. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. I usually isolate it by going through the wiring schematic and disconnecting areas of the circuit until I find the short.

Most of the time the short is in the ECM but it may have a short in the wiring going to it.


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