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Old 05-02-2005, 09:32 PM
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Brake lights problem

Just finished wiring the brake lights on my truck with a "Painless" wiring kit and I got a problem..When I went to test them, they turned off when I would press the brakes not get brighter. I tried reversing the wires on the brake switch but it didn't change. Anyone have any ideas?

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Old 05-02-2005, 09:49 PM
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I think you need to edit your statement... "When I went to test them, they turned off when I would press the brakes not get brighter".

The fact that you reversed the wires on your brake switch indicates you may need to have a little better understanding of how this circuit works (reversing the wires makes no difference)... it is a bit complicated but its not rocket science either.

Do yourself a favor and study the following
diagram until you understand it. You will have a whole lot better chance of solving your problem through understanding rather than just stumbling on a fix.
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Old 05-03-2005, 03:12 AM
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Now I'm really cornfuzzed...

Doc here,

OK...If I understand the post correctly, When you step on the brakes, (assuming the tail lights are on?) They are the same luminance? Can't see them with the lights on?

If this is the case, you might have the tail light filaments wired to the brake light circuit and visa versa...(tails Bright, Brakes dim) If That is the case, reverse the feeds to the tail & Brake lights, After you are sure the right bulbs are inserted.

If you have No brake lights at all (tails on or off) then troubleshoot your brake light circuit using your diagram from the fuse (assuming it is good) forward..for power. Where it drops out, (with the brake light switch activated ) Will be your problem.

Be sure you have proper grounds at the sockets also.

A little more Descriptive Information would be very helpful for us to help more.Type of vehicle, is this a pedal mounted switch, pull for on or push for on,(maybe mounted Mechanically backward) or master cylinder type switch, Ect...

Doc
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Last edited by docvette; 05-03-2005 at 03:20 AM.
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Old 05-03-2005, 08:41 AM
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It's a painless wiring kit in an s10. The 12 circuit pro street kit. I'm using the mechanical brake switch from watsons street works.
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Old 05-03-2005, 09:34 AM
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If the lights are on and then go off when you press the brake pedal, my guess would be that you have a brake light switch that includes normally closed and normally open circuits. They are separate. The brake light wires should be run through the normally open circuit. The normally closed circuit is used for TCC and cruise control functions. Check if you have both circuits and maybe have the brake light wires run through the normally closed circuit. Good luck, Ed
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Old 05-03-2005, 03:45 PM
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Switch

Doc here,

You still didn't say if the lights were coming on or not at all, if they were staying on all the time and going off when you depress the pedal, or if they were operable but just dimmer than the brake lights.

As edge Suggested, Normally open/normally Closed functions of the switch are a place to check..

Also the mechanical orientation of the switch..Is the switch designed to be "On" when pulled (like from a spring?) or it designed to be "On" when pushed (linkage or Gravity followed) ?

If it were a push type mounted BEHIND the pedal, it would operate backward ("On" no pedal.."Off" with pedal) and visa versa on the other type of switch.

More on what it Is/Isn't doing please..
Sorry..

Doc
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Old 05-04-2005, 07:33 PM
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Quote:
Originally Posted by docvette
Doc here,

You still didn't say if the lights were coming on or not at all, if they were staying on all the time and going off when you depress the pedal, or if they were operable but just dimmer than the brake lights.

As edge Suggested, Normally open/normally Closed functions of the switch are a place to check..

Also the mechanical orientation of the switch..Is the switch designed to be "On" when pulled (like from a spring?) or it designed to be "On" when pushed (linkage or Gravity followed) ?

If it were a push type mounted BEHIND the pedal, it would operate backward ("On" no pedal.."Off" with pedal) and visa versa on the other type of switch.

More on what it Is/Isn't doing please..
Sorry..

Doc
Let's say I have my running lights on....When you push the brake pedal, the tail lights would go out completely not get brighter like they should. The mechanical brake switch is located behind the pedal and is activated by pushing on it. I don't understand what you are saying about the normally on/normally off stuff...please explain... Thanks
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Old 05-04-2005, 07:39 PM
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Quote:
Originally Posted by 406S18
The mechanical brake switch is located behind the pedal and is activated by pushing on it. ... Thanks

Generally the switch is on the front side of the pedal....nearest to driver...and is activated when you let the plunger come all the way out. Maybe, that is the problem.......
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Old 05-04-2005, 07:43 PM
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....but even with the brake pedal away from the switch, the lights never got brighter than running lights
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Old 05-05-2005, 03:02 AM
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getting more confused

Doc here,

Ok..stop right here....

FIRST...With NO lights on...you step on the brake pedal and then you get brake lights..yes or no?

SECOND...If you do, are those lights STAYING on without stepping on the pedal? have to disconnect the battery to get them off..yes or no?

THIRD...assuming they aren't staying on, and do come on with no lights on...With the lights on, when you step on the pedal, you notice NO difference in the rear lights? yes or no?

If that's the case in #3 you either have the wrong bulbs in the tail lights...OR the brake light wires at the sockets are wired wrong...

If it's Number 2...you have the wrong switch in there OR it's mounted backwards..OR your on the Cruise control terminals on the switch for the brake lights...

Number 1 confirms number three...

Normally open, Normally Closed refers to the contact arrangement inside the switch, a switch that has normally open contacts, means the switch is "Open" and does NOT make a circuit static, or at rest..(no pedal applied in your case, no lights..pedal applied, lights go on...)

A Switch that has Normally closed contacts means the switch is "CLOSED" or making a complete circuit at static or rest..(lights ON no pedal applied,lights off..pedal applied...)

To figure out which switch you have, get an ohm meter, set it for R x 1 or autorange...REMOVE the wires from the switch and measure across the switch,It should read 000 if it is normally closed...If it is normally open, it should read infinite (no change in the reading) Yours SHOULD be normally open for brake lights, If you have or the truck had cruise control, the other set of contacts will be normally closed.

Then Depress the pedal..the readings SHOULD reverse...

How many terminals on your switch? 2, 3 or 4? If you don't have CC, then the attached photo is the type switch you should be using..

If it is mounted on the dash side or the pedal..it should be normally closed...if it is mounted on the firewall side of the pedal it should be normally open..

Doc
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Last edited by docvette; 05-05-2005 at 03:08 AM.
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Old 05-05-2005, 08:15 AM
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Quote:
Originally Posted by docvette
Doc here,

FIRST...With NO lights on...you step on the brake pedal and then you get brake lights..yes or no?

SECOND...If you do, are those lights STAYING on without stepping on the pedal? have to disconnect the battery to get them off..yes or no?

THIRD...assuming they aren't staying on, and do come on with no lights on...With the lights on, when you step on the pedal, you notice NO difference in the rear lights? yes or no?

If that's the case in #3 you either have the wrong bulbs in the tail lights...OR the brake light wires at the sockets are wired wrong...

If it's Number 2...you have the wrong switch in there OR it's mounted backwards..OR your on the Cruise control terminals on the switch for the brake lights...

How many terminals on your switch? 2, 3 or 4? If you don't have CC, then the attached photo is the type switch you should be using..

Doc
1. With no lights on, when you step on the brakes, no lights come on.
The tail lights are LED's
Here is the brake switch I am using.
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Old 05-05-2005, 04:13 PM
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Lights , Switch

Doc here,

The brake light Switch should be Hot at all times regardless of if the light switch or ignition switch is on or off..

Do you have 12 volts to one side of the switch, AT ALL TIMES? If so..Activate the switch and see if you get 12 volts on the other side of the switch.

If so, Your problems exist on the rear harness..Check at the brake light sockets, and see if you have 12 volts there when someone steps on the brake pedal..

If not check between there and the Brake light switch for an open wire.

If so, check the polarity on the L.E.D. tail lights...Unlike a light bulb you have a cathode and anode on an L.E.D. and this only conducts current in one direction ONLY , where a light bulb doesn't care...

SO be sure your light polarity is correct..after you confirm power from the switch to the L.E.D.

Doc
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Last edited by docvette; 05-05-2005 at 04:20 PM. Reason: After~thought, Endorphin misfire...
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