brake lights

hotrod ford · Post by **hotrod ford** » Fri Sep 04, 2009 2:13 pm

ok, this is the last thing to pass inspection. i have found no brakes in wires, so could it be a blown fuse?

fordman · Post by **fordman** » Fri Sep 04, 2009 2:33 pm

yes it could be. the on eonethe bottom right i think is the brake power. from there it goes to the brake pedal switch. and then up and thru the column and then back out to the brake lights.

hotrod ford · Post by **hotrod ford** » Fri Sep 04, 2009 3:26 pm

ok, got them to work partly, but they don't work when the lights are on.

cep62 · Post by **cep62** » Fri Sep 04, 2009 4:30 pm

hotrod ford wrote:ok, got them to work partly, but they don't work when the lights are on.

Sounds like you have a ground problem.
See if the light is grounded to the box and the box is grounded to the frame.

hotrod ford · Post by **hotrod ford** » Fri Sep 04, 2009 4:52 pm

ok. thanks

hotrod ford · Post by **hotrod ford** » Sat Sep 05, 2009 10:49 am

alright, there is no ground wire that i can find. the brake switch wires are like this: the white one goes to the back of the truck and the red one goes to the battery. funny thing is, my wife said when i hit the brake pedal even the front blinkers light up. is this because there is no ground? where do i splice the ground wire into?

JMcTurnan · Post by **JMcTurnan** » Sat Sep 05, 2009 1:01 pm

The fuse box is already grounded through running positive and negative wires. More than likely your wires could be a little mixed up. Possibly a broken wire.

hotrod ford · Post by **hotrod ford** » Sat Sep 05, 2009 1:21 pm

no, just got done rplacing the wires from the brake switch and added a ground. still does the same thing. no brakes when the lights are on.

the wire the goes to the back is a replacement wire. it is routed into the parking lights i think. isn't the brake light supposed to be brighter than the park light? if so, when i press the brakes the park light goes on and off. on the light bulb there are two springs. the bigger on should be for the brakes i think.

Post by **70_F100** » Sat Sep 05, 2009 3:32 pm

Try cleaning the contacts on the bulbs.

Many times, there is some "bleed-through" if both contacts are not making a good connection.

Other than that, check your grounds.

If it's none of these, sell the truck, it can't be fixed... LOL

hotrod ford · Post by **hotrod ford** » Sat Sep 05, 2009 3:55 pm

found the problem. the brake wire was running into the park lights. removed it and spliced it into the other terminal and they worked. took it to get inspected and it passed. yeeeesssss.

fordman · Post by **fordman** » Sat Sep 05, 2009 4:22 pm

i was going to say after reading for a second or two. the brake and taillights are the same circut/wire /side of the element in the bulb.

cep62 · Post by **cep62** » Sat Sep 05, 2009 7:48 pm

I just got back in, I wasn't sure so I checked mine .

The bulb grounds to the tail lamp housing then to the box then the box bolts to the frame and completes the circuit.
If you have any rust it'll make a bad conductor and then your park lamps will come on because it'll ground through the tail lamp wiring. Electricity is like water it takes the path of least resistance.

I'm glad you found your problem.

Post by **70_F100** » Sat Sep 05, 2009 8:47 pm

rjewkes · Post by **rjewkes** » Sat Sep 05, 2009 10:14 pm

I was gonna say you had melted through wiring( an exhuast shop cuased this installing my mufflers), or crossed for sure.

Glad you fixed it.

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