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burned fuse at power relay

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tejas
Novice

Nov 18, 2009, 10:42 AM

Post #1 of 4 (2000 views)
post icon burned fuse at power relay Sign In
HAVE FORD F150 2001 YEAR BURNED FUSE #18 AT FUSE BOX UNDER HOOD. THAT FUSE CONTROLS POWER RELAY. TRACED SHORT TO THE IDLE AIR CONTROL VALVE. REPLACED IT. DROVE IT AROUND BURNED FUSE #18 AGAIN. CAN'T SEEM TO FIND SHORT.....IDLE AIR WAS TESTED AND OUT SPECS. CHANGED FUSE FROM 15 AMPS TO 20 AMPS. NOW TRUCK SEEMS TO HAVE NO SHORTS....ANY IDEAS WHERE TO LOOK...NOT COMFORTABLE WITH 20AMP FUSE.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 18, 2009, 11:36 AM

Post #2 of 4 (1997 views)
Re: burned fuse at power relay Sign In
What year and what engine do you have?



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



tejas
Novice

Nov 18, 2009, 3:24 PM

Post #3 of 4 (1988 views)
post icon Re: burned fuse at power relay Sign In
FORD F150 YEAR 2001.....ENGINE 4.6...AUTOMATIC WITH A/C AND CRUISE....I SEEMED TO BE STUMPED


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 18, 2009, 3:40 PM

Post #4 of 4 (1981 views)
Re: burned fuse at power relay Sign In
That fuse has nothing to do with the IAC. It powers the injectors, PCM, fuel pump relay and Mass Air flow sensor.


Shorts can be rela tough to find, especially if they are intermittent. The procedure is to basically disconnect and isolate each component until it stops blowing the fuse. If this is intermittent, you obviously can't unplug these sensors and drive around. What you may have to do is rig up an ammeter that you can put in series with each of the components individually to monitor while you drive if the draw becomes excessive. The fact that the 20amp hasn't blown indicates that it's only excessive draw and not a dead short. That makes it even harder.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Nov 18, 2009, 3:44 PM)





 
 
 






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