brake lights not working
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Fleet Mechanic
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From: va
brake lights not working
I did lower the steering column, onto the seat. Also lowed the dash and the wiring. Does it sound like the Multifunction switch could be bad? I can put it in drive, so I don't think it's the brake light pedal switch, that's bad.
Thanks for any help,
mike
Thanks for any help,
mike
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Fleet Mechanic
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From: va
"Does the 93 have a high mount third brake light"
No, but the the cargo light doesn't work. Are they connected together somehow? I have the steering column open and the wiring bundle loosen from the column. I tilt the steering wheel up and down no difference with the brake lights. I tried pulling and pushing each wire on the plugs behind the multifunction switch, no help.
No, but the the cargo light doesn't work. Are they connected together somehow? I have the steering column open and the wiring bundle loosen from the column. I tilt the steering wheel up and down no difference with the brake lights. I tried pulling and pushing each wire on the plugs behind the multifunction switch, no help.
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From: Virginia
Get a testlight or meter.
First check the brakelight fuse and you can also check it for power. It should have power at all times.
Then check the brake pedal switch. The wires you are looking for are lightgreen red and lightgreen(see diagram below). Lightgreen/red should have power all the time, lightgreen should have power when you push the brake pedal.
Since you have the wiring loose at the column, check the light green wire going into the multi-function switch. It should have power when the pedal is pushed.
If you have power going into the switch when the pedal is pushed, make sure the switch is in the center position, and check for power on the lightgreen/orange wire and the orange/lightblue wire. These are the wires going to the rear lights, and if the switch is in the center, both should have power when the pedal is pushed.
First check the brakelight fuse and you can also check it for power. It should have power at all times.
Then check the brake pedal switch. The wires you are looking for are lightgreen red and lightgreen(see diagram below). Lightgreen/red should have power all the time, lightgreen should have power when you push the brake pedal.
Since you have the wiring loose at the column, check the light green wire going into the multi-function switch. It should have power when the pedal is pushed.
If you have power going into the switch when the pedal is pushed, make sure the switch is in the center position, and check for power on the lightgreen/orange wire and the orange/lightblue wire. These are the wires going to the rear lights, and if the switch is in the center, both should have power when the pedal is pushed.
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Fleet Mechanic
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From: va
[QUOTE=Franklin2;15155447] Check the brake pedal switch. The wires you are looking for are lightgreen red and lightgreen. Lightgreen/red should have power all the time, lightgreen should have power when you push the brake pedal. Lightgreen/ red wire has no power, plugged in and unplugged. The light green wire has power all the time. The light green/red wire going to the park brake switch has power, don't know if that helps.
Since you have the wiring loose at the column, check the light green wire going into the multifunction switch. It should have power when the pedal is pushed. I have power all the time at that wire.
When I try to bypass the brake pedal switch with a paper clip, It will blow the # 13 fuse each time.
Since you have the wiring loose at the column, check the light green wire going into the multifunction switch. It should have power when the pedal is pushed. I have power all the time at that wire.
When I try to bypass the brake pedal switch with a paper clip, It will blow the # 13 fuse each time.
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From: Virginia
How are you using the meter or testlight? Are you putting one lead on a good ground somewhere under the dash and poking around with the + meter lead?
Something is not right with your readings. If you have power all the time at the multifunction switch on the lightgreen wire, your brake lights would be on all the time. Are you using a digital meter? If you are, maybe you would have better results using a testlight. Harbor Freight has good ones pretty cheap. A testlight is better for troubleshooting lighting circuits.
Something is not right with your readings. If you have power all the time at the multifunction switch on the lightgreen wire, your brake lights would be on all the time. Are you using a digital meter? If you are, maybe you would have better results using a testlight. Harbor Freight has good ones pretty cheap. A testlight is better for troubleshooting lighting circuits.
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Fleet Mechanic
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From: va
brake lights
Yes the top light bulb (rear lights) is on all the time, I tested it at night so I didn't notice. When I press on the brake it would get brighter right? Maybe the bulb is at the brightest right now, like with the brake on. I thought is was the normal park light that were on. Putting a paper clip to bypass the brake switch and it blows a fuse means what?
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From: Virginia
That makes no sense at all. What are you doing when you bypass the brake switch? You are doing it's job. It's job is to connect the two lightgreen wires together when the pedal is pushed. Why doesn't the switch blow the fuse when the brake pedal is pushed?
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Fleet Mechanic
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From: va
no brake lights
Get a testlight or meter.
First check the brakelight fuse and you can also check it for power. It should have power at all times.
Then check the brake pedal switch. The wires you are looking for are lightgreen red and lightgreen(see diagram below). Lightgreen/red should have power all the time, lightgreen should have power when you push the brake pedal.
Since you have the wiring loose at the column, check the light green wire going into the multi-function switch. It should have power when the pedal is pushed.
If you have power going into the switch when the pedal is pushed, make sure the switch is in the center position, and check for power on the lightgreen/orange wire and the orange/lightblue wire. These are the wires going to the rear lights, and if the switch is in the center, both should have power when the pedal is pushed.
First check the brakelight fuse and you can also check it for power. It should have power at all times.
Then check the brake pedal switch. The wires you are looking for are lightgreen red and lightgreen(see diagram below). Lightgreen/red should have power all the time, lightgreen should have power when you push the brake pedal.
Since you have the wiring loose at the column, check the light green wire going into the multi-function switch. It should have power when the pedal is pushed.
If you have power going into the switch when the pedal is pushed, make sure the switch is in the center position, and check for power on the lightgreen/orange wire and the orange/lightblue wire. These are the wires going to the rear lights, and if the switch is in the center, both should have power when the pedal is pushed.
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From: Virginia
Ok, let me completely start over. I got a test light now. "Lightgreen/red should have power all the time, lightgreen should have power when you push the brake pedal." Lightgreen/red has power, lightgreen no power. When I push the brake pedal, it blows fuse 13. I did bypass the brake switch with a paperclip and it blow the fuse to. What do you think is happening, what do I check now?
If the above is the case, I would suspect a pinched or skinned up wire where you had the column apart.
If the fuse doesn't blow, the problem still could be in the column, but it will be with one of the colored wires going down and out to the rear lights. You could also see if you have another plug at the bottom of the column. You could unplug that also and see if the fuse blows or doesn't.
If this is a new problem you never had before tearing into the steering column, I would really check that out before I moved on to any other wiring areas.
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Fleet Mechanic
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From: va
If the fuse doesn't blow, the problem still could be in the column, but it will be with one of the colored wires going down and out to the rear lights. You could also see if you have another plug at the bottom of the column. You could unplug that also and see if the fuse blows or doesn't.
After unplugging the multifunction switch and pushing on the brake the fuse didn't blow. So the two wires coming up the column for the tail lights are Lt Grn/ Org and Org/Lt Blu. How would I test these wires? So one of these 2 wire may be touching metal or each other?
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From: Virginia
I am trying to figure the easiest way to check these other wires in the column.
You do have a plug at the bottom of the column correct? Unplug it. Plug the multifunction switch back in. Here's the tricky part;
We need the brake signal to pass into the column for testing. When you unplug the bottom wiring plug, you have probably also unplugged the light green going up the column. So if you could rig a little piece of wire to jump the lightgreen wire from plug to plug, but keep the plugs separated otherwise, that would pass the brake signal up into the column, let it go through the multifunction switch, back down the column on the two colored wires, and stop at the plug. Once you get this setup, push the brake pedal and see if the fuse blows.
If it doesn't blow, you problem is not in the column.
You do have a plug at the bottom of the column correct? Unplug it. Plug the multifunction switch back in. Here's the tricky part;
We need the brake signal to pass into the column for testing. When you unplug the bottom wiring plug, you have probably also unplugged the light green going up the column. So if you could rig a little piece of wire to jump the lightgreen wire from plug to plug, but keep the plugs separated otherwise, that would pass the brake signal up into the column, let it go through the multifunction switch, back down the column on the two colored wires, and stop at the plug. Once you get this setup, push the brake pedal and see if the fuse blows.
If it doesn't blow, you problem is not in the column.
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From: Virginia
Your problem must be on the two colored wires going to the rear. You might want to go to the rear of the truck, find the plug back near the rear bumper that unplugs the lights, and unplug it. Plug back in the column and press the brake and see if it blows the fuse.
Keep thinking of what might be causing it. Do you have trailer wiring back there? Fender bender in the rear lately? Anything happen along the driver's side frame rail?
Keep thinking of what might be causing it. Do you have trailer wiring back there? Fender bender in the rear lately? Anything happen along the driver's side frame rail?