Question about 1999 Ford Super Duty F 450

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2004 F 450 turn signal fuse size

We were wondering what is the correct size of fuse for the F450 turn signals. It has been blowing the size 10 fuses regulary.

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You probably have a short somewhere within the power line if the fuse keeps blowing put a green 30 in and see if that fixes it if not then you need to find out where the short is..it is almost impossible you will probably have to taker it to a dealer...hopefully the biger fuse will work..good luck

Posted on Oct 31, 2008

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Your going to have to inspect the wiring harness at the front and rear. Look for cuts in the tape or conduit. And laying against the frame. Probably have to pull the lens out also.

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1987 ford ranger turn signals keep blowing fuses. have changed flasher fuse and switch on column. just keeps blowing?


first thing i guess to understand what is going on here ,is a little back to basics on how turnsignals work , first item you have is power fuse then it's off to flasher module than it goes to the turnsignal switch on colum ,of course anywhere on it way to there the power could got to ground and cause the fuse to trip, now the power depending on Left or right selection , is directed to lights on both front and back of truck,thankfully rangers don't have em on the side) now any place in this pathway the wire could go to ground and blow the fuse, now to troubleshoot and narrow down the area that fault is located , (1) replace fuse with correct size and ck for proper fit in fusebox and start and operate truck for a few minutes DO not use turnsignals, ck fuse is it still good if so go to step 2 if not stop and ck wire conditions in steering colum and switch(2) start truck and try right hand turn signal only verify lights working ,Ok yes/no if not replace fuse and try left side same way, Ok yes /no if right or left side only blows fuses take ALL bulbS OUT of lights and try again , if fuse still blows then look for wire fault on that side of truck if fuse is still good then look carefull at light bulb sockets for rust and powered corrosion (ill bet an 87 has some ) you may need to replace bulb sockets , they do sell em in autoparts stores .

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All of these functions are controlled by the totally integrated power module (TIPM) so the first thing to do is check 30A fuse 10. Next, check 10A fuse 30 in the power distribution center (PDC). Power passes through the steering control module and the right steering switch to the horn switch. Pressing the horn switch sends a signal through the right steering switch and the steering control module to the TIPM which applies 12 volts to the horns, causing them to blow. If all fuses check good, the problem is in the other circuitry.

If fuse 10 in the TIPM is good, operation of the turn signal switch should cause the turn signals to flash.

If fuse 10 in the TIPM is good, check 5A fuse 35 and 10A fuse 30 in the PDC. If all fuses are good, the wipers should work.

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Okay, we will need to pin point the short,first remove connector from wiper motor and install a fuse and see if it blows. if it does then we know its not the wiper motor.next, will fuse blow when key is turned on or do you have to turn on signals? if its when signals are working then check all bulbs, remove signal bulbs one at a time and make sure the correct bulb is in the socket and the bulb and socket are good, if all checks out then i would say you may have a bad switch,let me know what the outcome of these tests are i will help you fix problem or give you price. good day

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COULD BE BLOW FUSE.FAULTY TURN SIGNAL SWITCH OR FAULTY TURN SIGNAL FLASHERS WHICH IS LOCATED FUSE / RELAY BOX JUST LEFT OF THE STEERING COLUMN.

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Check the front and rear (although probably the rear) turn signal bulb socket for corrosion and/or water intrusion. If you find corrosion attempt to clean (but you will probably have to replace the socket and bulb). For water intrusion you will probably have to replace the break lamp assembly.

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1 Answer

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try checking all of your fuses and see which ones are blown. you have two sets of fuses and they are under the hood of the vehicle and under the dash on the driverside or in the glove box. if the don't work after changing the fuses then your wiring for the turn signals and brake lights need to be cheked from the fuse boxes to the swith for the trurn signal and to your brake lights

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3 Answers

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you might need a Turn Signal Column Switch, I have a 1993 Nissan Pickup and my fuse blew all the time. I dexed that problem i have some wires in the back of the truck that was rubbing on the frame. Now my running lights are not working and when i turn on my head light one will come on so i will have to turn on and off about 10 times then both of them will come on, so my turn signal switch is bad.
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