Hot Rod Forum : Hotrodders Bulletin Board - Reply to Topic
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Electrical> Universal Stop Light Switch Wiring
User Name
Password
lost password?   |   register now

Thread: Universal Stop Light Switch Wiring Reply to Thread
Title:
  
Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Additional Options
Miscellaneous Options

Topic Review (Newest First)
01-06-2013 01:45 PM
vicrod
more to the point

Good to hear you found the problem.
The battery disconnect does not help you when you are using the car. Although it is good for storage or a safety disconnect.
More importantly, all circuits must be fused properly.
This includes the main accessory wire from the battery that needs a fuse link or a maxi fuse.

All viewers of this thread, be advised.

vicrod
01-05-2013 04:55 PM
EOD Guy Good to hear you got it fixed
01-05-2013 09:23 AM
Sweet-34
Problem Solved!!!

The switch had shorted out causing an overload on the wiring. The Brake Switch had a 30 amp fuse in it and that is why it didn't blow the fuse.

I replaced the 30 amp with a 20 amp as Painless Wiring suggested. All is well.......no more heat/smoke and the new switch works perfectly.

I already had a disconnect for the battery installed but was working on the car (start/run) when this happened.

From now on......I'll never park any of my cars for any period of time without diconncecting the batteries. Could of burned my house down if it would have happened in the middle of the night.

I would suggest to everyone to install a quick battery disconnect. You just never know!!!


Thanks to everyone for your help!!!!!!!
01-02-2013 11:04 AM
Sweet-34
Quote:
Originally Posted by cobalt327 View Post
Headlight and fans, use a relay.

Basic fuse requirements (from Painless wiring):

Cigarette Lighter……………………………………………….20
Headlight Switch……………………………………………….30
Emergency Flashers………………………………………….15
Turn Signals………………………………………………………15
Gauges………………………………………………………………10
AC/Heat Relay…………………………………………………….5
Radio (Constant)……………………………………………….10
Horn…………………………………………………………………..20
Door Lock…………………………………………………………..20
Wipers………………………………………………………………..15
Brake Switch………………………………………………………20
Dome/Trunk……………………………………………………….10
Electric Fan Relay………………………………………………..5
Power Antenna……………………………………………………10
Power Windows…………………………………………………..20
Electric Fuel Pump………………………………………………15
Coil……………………………………………………………………...30
Radio Ignition (Switched)……………………………………10
Backup/Cruise Control…………………………………………10

The fuse requirement and wire gauge has to take the accessory load into consideration. Using too small of a wire can let a wire burn even though the accessory load matches the fuse rating. Using too 'big' of a fuse can let a wire burn even if the wire gauge matches the load.

Testing:

Set the meter to the 20 VDC volt scale (or whatever is close to that). Ground the neg. meter lead, then probe the wires separately. In the "at rest" position- brakes not depressed, there should be power IN but not OUT.

With the brakes depressed there should be power at BOTH terminals.

If there is no power IN, the wire has burned or the fuse blown, or the wire has been disconnected.

If there's power IN to the switch but nothing OUT with the switch activated, you have a bad switch.

You can also test the switch using the ohm setting, be sure to disconnect the switch from the wiring first. Connect the meter leads, one lead to each terminal. If the switch is OK, you should have continuity (close to zero) with the switch activated (brakes ON), and infinity with the switch at rest.

If you have a high ohm reading w/the brakes ON, or infinity, the switch is no good.
Thank you so much for taking the time to help me with my problem. I will post when I solve the issue.
01-02-2013 09:47 AM
cobalt327 Headlight and fans, use a relay.

Basic fuse requirements (from Painless wiring):

Cigarette Lighter……………………………………………….20
Headlight Switch……………………………………………….30
Emergency Flashers………………………………………….15
Turn Signals………………………………………………………15
Gauges………………………………………………………………10
AC/Heat Relay…………………………………………………….5
Radio (Constant)……………………………………………….10
Horn…………………………………………………………………..20
Door Lock…………………………………………………………..20
Wipers………………………………………………………………..15
Brake Switch………………………………………………………20
Dome/Trunk……………………………………………………….10
Electric Fan Relay………………………………………………..5
Power Antenna……………………………………………………10
Power Windows…………………………………………………..20
Electric Fuel Pump………………………………………………15
Coil……………………………………………………………………...30
Radio Ignition (Switched)……………………………………10
Backup/Cruise Control…………………………………………10

The fuse requirement and wire gauge has to take the accessory load into consideration. Using too small of a wire can let a wire burn even though the accessory load matches the fuse rating. Using too 'big' of a fuse can let a wire burn even if the wire gauge matches the load.

Testing:

Set the meter to the 20 VDC volt scale (or whatever is close to that). Ground the neg. meter lead, then probe the wires separately. In the "at rest" position- brakes not depressed, there should be power IN but not OUT.

With the brakes depressed there should be power at BOTH terminals.

If there is no power IN, the wire has burned or the fuse blown, or the wire has been disconnected.

If there's power IN to the switch but nothing OUT with the switch activated, you have a bad switch.

You can also test the switch using the ohm setting, be sure to disconnect the switch from the wiring first. Connect the meter leads, one lead to each terminal. If the switch is OK, you should have continuity (close to zero) with the switch activated (brakes ON), and infinity with the switch at rest.

If you have a high ohm reading w/the brakes ON, or infinity, the switch is no good.
01-02-2013 07:44 AM
Sweet-34
Fuses

Quote:
Originally Posted by vicrod View Post
The first and most important issue is a fuse should have blown which would protect the wiring in this type of failure.
A test of the switch can be done with an ohmmeter. With the wires disconnected, test each of the two terminals with respect to ground. You should have no resistance reading on either terminal.
Also a short to ground could be occurring somewhere else in the circuit. But it seems like the switch is the problem.
The 42 amp rating is the capacity of the switch contacts to handle current up to 42 amps without damage. Not an issue in this situation.

vicrod
All fuses are 30 Amp. What fuse amp should be used for:

Headlights/Tailights

Brakelights

Engine Cooling Fan

4-Ways

I used a Continuity Tester and it showed continuity in the off position and no continuity in the on position. I touched one pole with one end wire from tester and the other pole with the other end of the tester. Am I doing it right....or should I be touching the lead of the continuity tester to a good ground (steel brakeline) and touch each terminal on the switch and see if I get a reading?

I used a Test Light and grounded it to a steel brakeline and it showed nothing when I touched each post on the switch.

All comments welcomed.
01-02-2013 02:59 AM
EOD Guy My vote is the switch, the others have given sounds advice, fuse should have blown before the wires got hot enough to smoke......... try putting just a hi amp toggle in place of the brake switch, for testing only, and see if you still have warm wires etc......
01-01-2013 08:25 PM
John long
Quote:
Originally Posted by Sweet-34 View Post
The first thing I noticed and forgot to mention was that the brake lights were on....and I walked to the front of the car and pulled up the hood and saw smoke.

I'll check the switch tomorrow.


Thanks
The universal switch is mechanical so it could be shorted or out of adjustment and getting hot do to being on so long. I think you are on the right track.

John
01-01-2013 08:07 PM
Sweet-34
Quote:
Originally Posted by John long View Post
The chances are slim the problem is in the switch. Disconnect the switch and using a test light or ohm meter, see if you get continuity from either terminal to ground. If so the switch is bad. If not the trouble can not be in the switch. If the switch was shorted your brake lights would just come on. It the switch is not shorted the problem must be beyond the switch.

John L
The first thing I noticed and forgot to mention was that the brake lights were on....and I walked to the front of the car and pulled up the hood and saw smoke.

I'll check the switch tomorrow.


Thanks
01-01-2013 07:43 PM
vicrod
fuse

The first and most important issue is a fuse should have blown which would protect the wiring in this type of failure.
A test of the switch can be done with an ohmmeter. With the wires disconnected, test each of the two terminals with respect to ground. You should have no resistance reading on either terminal.
Also a short to ground could be occurring somewhere else in the circuit. But it seems like the switch is the problem.
The 42 amp rating is the capacity of the switch contacts to handle current up to 42 amps without damage. Not an issue in this situation.

vicrod
01-01-2013 07:02 PM
John long The chances are slim the problem is in the switch. Disconnect the switch and using a test light or ohm meter, see if you get continuity from either terminal to ground. If so the switch is bad. If not the trouble can not be in the switch. If the switch was shorted your brake lights would just come on. It the switch is not shorted the problem must be beyond the switch.

John L
01-01-2013 06:28 PM
Sweet-34
Universal Stop Light Switch Wiring

I put one of these Universal Stop Light Switches on my hotrod. It originaly had an inline pressure switch. I eliminated it and extended the wiring up to the Universal Stop Light Switch as seen in the picture.

It worked perfectly for about 8 months....but today while doing other work on the car I smelled something burning and smoke was coming from the area where the wiring hooked to the Universal Stop Light Switch.

I disconnected the battery and of course the smoke and smell disappered.

I unplugged the two wires to the switch and hooked the battery back up with the wires unplugged from the switch and the wires showed no evidence of heat or smoke.

I hooked the wires to the switch and connected the battery back up and the wires were getting warm again, so I unplugged them.

This switch says it is rated at 42 Amp max. What does that actually mean? Did I do something wrong by just extending the wires from the pressure switch to the front of the vehicle and plug them into this Universal Switch?

OR....is it a defective China made switch and I can just replace the switch and everything will be OK?


I thank you in advance for your input on this subject.

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -6. The time now is 11:58 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.