my 02 f150 crew cab keeps blowing a fuse (#14??) so my windows and interiors lights don't work. i keep replacing the fuse but at random it keeps blowing. the power lock buttons work but not the windows? any suggestions?? thanks-matt

 

get it checked for shorts. thats most likely your problem. did you buy the truck used? you may also want to compare what fuse your putting in to what fuse the manual says needs to be there. supposed to be 15 amps.

 

keeps blowing and im' using a 15 fuse. as much as i'd love to take it in to get it looked at i'm always working, so no time (good exucse eh?). is there anything i can do without taking it in?

 

Q1. By crew cab, so you mean Super Crew ?

The Fuse #14 is for the battery saver relay which is the interior lamps, and feeds the accy delay relay.

The Accy delay relay is what the power windows run through.

This is Battery Junction Box Fuse # 601 for the Super Crew.

So if either Fuse #14 or fuse #601 ( Screw ) blow, the windows won't work.

With the add in of the interior lamps go dead, that shows the problem with the battery daver relay.

One test, remove the Accy delay relay ( relay #5 passenger compartment ) and replace Fuse #14, to see if it still blows.

This will remove the Power windows from the equation, by removing the relay. Don't know how long yu have to wait, or if there is a specific time / circumstance that causes it to blow ( specific section of road with bumps ).

For the mean time, you can always jumper the Accy delay relay socket, pin #30 to Pin #87.
NOTE : This will cause your power windows to be active ALL the time. The Power window fuse #601 is hot at all times.

The test here is to remove the power windows ( via the Accy Delay relay ) from the cause of the fuse #14 blowing.
Fuse #14 will only have the interior lamps on it, and the interior lamp relay.
The GEM switches ground to the Battery saver relay, which the output of the N.O. contacts ( same Fuse #14 as the battery saver coil ) feeds the Interior lamps relay coil, as well as the N.O. contacts of the interior lamp relay.

The N.O. contacts on the interior lamp relay feed the glove compartment, engine compartment, and Door courtesy lamps.

Sorry for the long post, just want to try to explain why removing the Accy delay relay coil power and what else should still work.

Give this a try for a few days and let us know what happens. You are right, no need to take it to a delaer, to have them charge you for shop time. This should just be time consuming to fix. Never could understand the take it to the dealer answer for simple things.

 

hey thanks for the post, i'll try it this weekend and let you know how it goes.

 

I'm reviving an old post here--working on a 2003 Super Crew, and it has the same symptoms. Fuse #14 blows, and no interior lights or power windows. It seems there is a dead short in one of the circuits fed by the batttery saver relay. If I remove the accessory delay relay the fuse still blows. I've looked at all the interior lights and haven't yet found the short. Has anyone else had this same problem?
Thanks

 

did you pull the interior lamp relay as well ?

CJB Fuse #14 also feeds the coil and the normally open contacts for the inerior lamp relay.

what does "looked at the interior lights" mean ?
- did you pull them out and stare at them, and put them back in ?

 

Yes. The fuse does not blow with the interior lamp relay in place, but it does blow with the battery saver relay installed. This tells me that the short is in a circuit fed by the battery saver relay, correct?



Well, OK, that's one way of putting it. I inspected the lamps for any sign of burnt or damaged sockets.
I still haven't figured out how to remove the front overhead courtesy lamp unit. Can you tell me how?

Tell me if my thinking is correct here: I connected one lead of my ohm meter to ground, and the other to the output terminal of the battery saver relay (#5).
The meter shows continuity, 0 ohms. Doesn't this indicate a short to ground? I would think that the normal condition would show some resistance.

 

Overhead console, they are 1/4 turn bulb holders from the rear.
My 2001 was a single screw in the bottom towards the windshield and I think spring clips to the back.
You might not have the screw in the front ( memory is telling me 02/03 MY did not have this ).

If the battery saver relay is out, the coil on the interior lamp relay is not powered ( which means Fuse #14 to the normally open contacts is not going to do anything ).
To say with the battery saver relay out and the interior lamp relay installed and the fuse does not blow, does not prove anything.

Battery saver relay powers :
1. Coil on the interior lamp relay
2. Coil on Accessory Delay relay
3. Glove compartment lamps
4. Engine compartment lamps
5. L & R vanity lamps
6. Interior / map lamps
7. L & R rail lamps
8. Interior lamp

 

Right. I should have said that the fuse blows with the battery saver relay installed whether or not the interior lamp relay is installed.

Thanks for the info; I'll keep looking.