fuse keeps blowing
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Junior User
Joined: Apr 2004
Posts: 73
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fuse keeps blowing
i have a 99 f350 psd, my problem is i don't have parking and instrument lights, it blows fuse number 8 as soon as i turn the switch on. i checked all the wiring on my tail lights, and the trailer hook ups. i even disconnected the wiring harness going the my tail lights and trailer hookups and it still blows the switch. #8 fuse is trailer tow elcetronic brake, illumination, park lamps, trailer tow park lamp relay coil. it also blows #4 fuse which is trailer tow backup lamps, trailer tow park lamps. help someone!!!
Elder User
Joined: Jul 2009
Posts: 919
Likes: 0
From: Smiths Grove, KY
The complete wiring diagram will be included in the service manual. If you don't have a set some dealerships will make a copy of the pages you will need for troubleshooting.
If the fuse blows as soon as the switch is turned on it is very possible that you have a short circuit. Have you tested any of the wiring for shorts to ground?
If the fuse blows as soon as the switch is turned on it is very possible that you have a short circuit. Have you tested any of the wiring for shorts to ground?
Elder User
Joined: Dec 2008
Posts: 745
Likes: 4
From: North Carolina
sorry, i have no idea where it is, i am just guessing based on your symptoms. you will need to consult a '99 shop manual for the electrical diagrams. I got one of those ebay shop manual CD's for my 2003 which works pretty good. Don't have it with me now though, or i would check for you.
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Elder User
Joined: Jul 2009
Posts: 919
Likes: 0
From: Smiths Grove, KY
I'm not familiar with the 1999, however normally relays are in two locations - fuse box in the cab and power distribution box under the hood.
An abbreviated electrical schematic can be found at this link:
https://www.fleet.ford.com/truckbbas/topics/1999/append_wiring.html
Owner's manual can be found at this link:
https://myford.fordvehicles.com/servlet/ContentServer?pagename=Owner/Page/HomePage
An abbreviated electrical schematic can be found at this link:
https://www.fleet.ford.com/truckbbas/topics/1999/append_wiring.html
Owner's manual can be found at this link:
https://myford.fordvehicles.com/servlet/ContentServer?pagename=Owner/Page/HomePage
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Junior User
Joined: Jan 2008
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I'm having this exact same issue. Did you ever figure out what the problem was?
Mine started as intermittent blowing of the fuse and after a while it just went out completely and blows shortly after replacing. The parking lights don't work at all and the dash lighting holds for about a minute after which the fuse blows.
Very frustrating as I'm forced to drive with hazards on at night.
Mine started as intermittent blowing of the fuse and after a while it just went out completely and blows shortly after replacing. The parking lights don't work at all and the dash lighting holds for about a minute after which the fuse blows.
Very frustrating as I'm forced to drive with hazards on at night.
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