tail lamp switch/relay???? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

russellmarling · 07-27-2006, 11:32 PM

I need some help identifying this mysterious electronic device. It makes the tail lamps come on when you turn the headlights on. It is rectangular and it has a dark green and a light green wire going to it. The wiring diagrams refer to it as the BKNG. LP. SW. This is not the stoplight switch that is mounted to the brake pedal assembly. What is this called and where can I get a new one? More importantly, where does it mount and what "flips the switch"? I know my description is vague, but this is all I know to say. Any help will be greatly appreciated.

Longhorn Man · 07-27-2006, 11:45 PM

backing light?
Brake light?
There's no relay in the tail light circuit, the power goes from the headlamp switch, straight to the tail lights.

russellmarling · 07-28-2006, 02:39 PM

This is a switch (or rectangular box of some sort) that turns the tail lamps on when you turn the headlamps on. The wiring diagrams show it as the BKNG LP SW and it is with the neutral safety switch (http://www.geocities.com/chevroletc1070/instrum1.html) I don't have a neutral safety switch. Do I need one to make this work? My brake lights and turn signals work great, I just need to fix this switch so my tail lamps will automatically come on when I pull the headlight switch. Thanks.

krue · 07-28-2006, 02:46 PM

That's the backup lamp switch isn't it?

cdowns · 07-28-2006, 02:48 PM

if your tail lights are coming on with that you've got a wiring problem because thats for the backup lights (clear) above the taillights(red) it mounts on the column with the neutral safety switch

russellmarling · 07-28-2006, 03:00 PM

Weird. Now it kind of makes sense. The original owner butchered the wiring trying to hook up trailer lights. Maybe I got those wires switched putting it back together. Thank you so much for your help everyone!

BobbyK · 07-29-2006, 02:34 AM

In our trucks the neutral safety switch activates the back up lights.It's all built into the switch.
It looks like the left one in this pic.

07-27-2006, 11:32 PM	#1
russellmarling Registered User Join Date: Jan 2006 Location: Highlands, NC Posts: 138	tail lamp switch/relay???? I need some help identifying this mysterious electronic device. It makes the tail lamps come on when you turn the headlights on. It is rectangular and it has a dark green and a light green wire going to it. The wiring diagrams refer to it as the BKNG. LP. SW. This is not the stoplight switch that is mounted to the brake pedal assembly. What is this called and where can I get a new one? More importantly, where does it mount and what "flips the switch"? I know my description is vague, but this is all I know to say. Any help will be greatly appreciated. __________________ '70 GMC SWB step-side- 454, 4 speed, air bags (in progress) '09 CTS-V M6 '03 Sierra SWB Z71 '82 Yamaha Seca XJ650R Turbo! '04 Yamaha FZ6

07-27-2006, 11:45 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: tail lamp switch/relay???? backing light? Brake light? There's no relay in the tail light circuit, the power goes from the headlamp switch, straight to the tail lights.

07-28-2006, 02:39 PM	#3
russellmarling Registered User Join Date: Jan 2006 Location: Highlands, NC Posts: 138	Re: tail lamp switch/relay???? This is a switch (or rectangular box of some sort) that turns the tail lamps on when you turn the headlamps on. The wiring diagrams show it as the BKNG LP SW and it is with the neutral safety switch (http://www.geocities.com/chevroletc1070/instrum1.html) I don't have a neutral safety switch. Do I need one to make this work? My brake lights and turn signals work great, I just need to fix this switch so my tail lamps will automatically come on when I pull the headlight switch. Thanks. __________________ '70 GMC SWB step-side- 454, 4 speed, air bags (in progress) '09 CTS-V M6 '03 Sierra SWB Z71 '82 Yamaha Seca XJ650R Turbo! '04 Yamaha FZ6

07-28-2006, 02:46 PM	#4
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,450	Re: tail lamp switch/relay???? That's the backup lamp switch isn't it? __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

07-28-2006, 02:48 PM	#5
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: tail lamp switch/relay???? if your tail lights are coming on with that you've got a wiring problem because thats for the backup lights (clear) above the taillights(red) it mounts on the column with the neutral safety switch __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

07-28-2006, 03:00 PM	#6
russellmarling Registered User Join Date: Jan 2006 Location: Highlands, NC Posts: 138	Re: tail lamp switch/relay???? Weird. Now it kind of makes sense. The original owner butchered the wiring trying to hook up trailer lights. Maybe I got those wires switched putting it back together. Thank you so much for your help everyone! __________________ '70 GMC SWB step-side- 454, 4 speed, air bags (in progress) '09 CTS-V M6 '03 Sierra SWB Z71 '82 Yamaha Seca XJ650R Turbo! '04 Yamaha FZ6

07-29-2006, 02:34 AM	#7
BobbyK Registered User Join Date: May 2000 Location: Petrolia,Ontario,Canada but working in Port Huron,Mi. Posts: 1,771	Re: tail lamp switch/relay???? In our trucks the neutral safety switch activates the back up lights.It's all built into the switch. It looks like the left one in this pic. __________________ 71 blazer,350SBC,approx.375HP,700R4,factory GM TPI.Dual electric fans,33x12.5x15 ATR on stock suspension. Petrolia,Ontario,Canada but working in Port Huron,MI. See ALL my Blazer pic's HERE Last edited by BobbyK; 07-29-2006 at 02:35 AM.



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