Foglights......1 works, 1 doesn't.... - Ranger-Forums - The Ultimate Ford Ranger Resource


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  #1  
Old 10-11-2007
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Foglights......1 works, 1 doesn't....

anyone got any ideas? 1 of my fog lights works (the passanger side) and the other doesn't (driver side).....i checked the plug and there is NO power getting to it......is there a place on my truck the power splits off after the relay? could it be a bad relay (is there a way to test the relays?)?

i guess i could just jump a wire from the + on the passanger side light to the + on the driverside light, but i don't want to overload the wiring, nor do i want to make it clustered...

BTW: i have checked the switch, and swapped it out with another switch....same thing happens..

anyone
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  #2  
Old 10-11-2007
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did you check fuses? i might have been seeing things, but last time i checked my owners manual, they have driver and passenger side lights on separate fuses for some reason
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  #3  
Old 10-11-2007
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Quote:
Originally Posted by jtslmn720
did you check fuses? i might have been seeing things, but last time i checked my owners manual, they have driver and passenger side lights on separate fuses for some reason
mine only has 1 fuse for the fogs in the cab, then a relay for the fogs under the hood......the fuse is good...
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  #4  
Old 10-11-2007
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i also know the bulb is good......since it isn't getting power at the plug.....and the filament in the bulb is still good...
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Old 10-11-2007
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i would check the wires and plugs for that side that does not work

if its a relay the relay would have a pole for each fog light. i dont think they do that.
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  #6  
Old 10-11-2007
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i know the relay has 5 pins on it....

wow....the wiring is gonna be hard to trace since it is all in factory taped wire loom
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  #7  
Old 10-11-2007
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Maurice,

It'll be perfectly acceptable (electrical load-wise) to splice the original wiring from one lamp's power wire to the other. That IS the way it is done from the factory, schematically, just after the foglamp relay - one wire out of the relay, to splice S127.

FWIW, the splice (S127, location unknown to me) also routes (that same) power back to the switch for led illumination that the switch is ON.

Each foglamp uses its own separate ground (G103 and G105 in 2000, each aft fenderwell). Those grounds are multi-use, so I don't suspect your problem is there (assuming that you used the meter's ground lead in the connector, rather than hitting the chassis). But it's worth a look if you've done anything in that area.

I'd peel back the wiring going away from the DS foglamp to try to find that (broken) splice.

Is your power wire TN/OG?

Does your switch "illuminate", showing foglamps are ON?
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Old 10-11-2007
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the power wire is TN/OG....

the switch shows that the lights are on....

wouldn't the plug still be getting power IF the ground was bad? i didn't use the plug for the ground, i used a spot on the chassie.....
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Old 10-11-2007
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Before I got to work on the wire loom, I would check and see if the ground wire is still good on the fog light. If it is, then I'd go ahead and check the 12v wire on there. Whichever one doesn't work (hopefully its only one), follow that to the furthest point you can, then test it there with a push pin and voltmeter to see if it has any voltage at that point. If there is voltage at that point, you've got a break in the wire somewhere.
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  #10  
Old 10-11-2007
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yea that is what i will do^^hopefully it is somewhere close

anyone of ya know how to check to see if a relay is good?
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  #11  
Old 10-11-2007
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Quote:
Originally Posted by lifted97ranger
i know the relay has 5 pins on it....

wow....the wiring is gonna be hard to trace since it is all in factory taped wire loom

replacing the relay would be the cheapest and easiest thing to do
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  #12  
Old 10-11-2007
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but if one light works, then the relay must be good righ am i correct in assuming that? anyone know if the relay is a SPDT?
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  #13  
Old 10-11-2007
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Correct. One output from the relay, to a splice.

Splice feeds each lamp plus the switch's led for ON indication.


BUT, I'm looking at a 2000 wiring diagram manual.

I doubt they did it differently for 97.
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  #14  
Old 10-11-2007
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dang.....i wish the wiring diagrams told ya were the splice was......i would imagine it is somewhere close since they wouldn't run wire all the way to the front, splice into the wire and run it all the way back to inside the cab (atleast i would hope not)...

since the relay has 5 pins on it, could the light in the switch for lights on be a normally closed light....when the relay is switched to send power to the light and it takes the contactor off the center pin, it causes the light to come on......just curious....i don't have the wiring diagrm infront of me.
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  #15  
Old 10-11-2007
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Quote:
Originally Posted by Earl43P
BUT, I'm looking at a 2000 wiring diagram manual.

I doubt they did it differently for 97.
i will have to look at my Chilton Manual when i get home to see if i can figure out how it was done....
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  #16  
Old 10-11-2007
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Did both fog lights work before you installed your last e-fan? Is there a chance you cut a wire(s) in the process of installing your e-fan?
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  #17  
Old 10-11-2007
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i got it fixed....it was a bad ground in the light.....thanks for the help fella's...
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  #18  
Old 10-12-2007
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Quote:
Originally Posted by lifted97ranger

i didn't use the plug for the ground, i used a spot on the chassie.....
How does the entire "chassie" loose ground, and makes 1 fog light stop working?
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  #19  
Old 10-12-2007
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Quote:
Originally Posted by Takeda
How does the entire "chassie" loose ground, and makes 1 fog light stop working?
it was the ground inside the light itself.....one on the bulb.....i must not have had my volt meter pushed in all the way when i metered it...
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  #20  
Old 10-12-2007
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I have had a car wash unplug one side of my lights before. Not totally removing the plug just yanking it out a bit. The where the fog harness plugs into the chassis harness on the rad support.
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  #21  
Old 10-12-2007
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Glad you got it fixed.
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