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How We Wire Old Style Sealed Beam Plow Lights

First and foremost I want to point out that this is how we wire the older style sealed beam plow lights, on pre-2007 vehicles. Most 2007 and newer vehicles need to have isolation modules installed because the BCM (Body Control Module) monitors amp draw for all circuits. In other words, the computer knows you added lights, and it does not like it. I also want to point out this is a vehicle specific requirement and has nothing to do with the brand of plow light. The wiring diagram below will work with any sealed beam headlight, fog light/driving light, or any replaceable bulb halogen light for that matter. Since we do mostly Meyer plows, we most often wire "Meyer by Truck-Lite" this way, as well as Truck-Lite ATL lights. I will add more detail to this page as time allows as I get many phone calls about this. I will answer the "Why do it this way?" question now though. Because this way, we do not cut into the vehicle headlight harness. What prompted me to make this page is we just spent about 5 hours repairing a 2000 Dodge 1500 that had the plow lights wired according to the Meyer/Truck-Lite instructions. Rather than tear out the wiring and start over, we tried to save the customer money by repairing what was bad only. BIG mistake. The splices under the battery turned to dust from the acid over the years. There were additional splices under the radiator support that also turned to dust. Thanks to a little help from my friend Jerre Heyer, we also found a blown headlight fuse. The light with the blown fuse was still lit dimly, backfeeding through a bad ground. Lesson learned. So we ended up doing it like we normally do, here is how we do it.

1. Gets connected to the red wire coming from the relay, which must be split to feed both plow lights.

2. Gets connected to the green wire coming off the relay, which must be split to feed both plow lights.

3. Gets spliced into the Marker Light on each side of the vehicle, or you can splice into one and split it to feed both plow lights.

4. Gets spliced into the vehicle turn signal on each side of the vehicle. NO QUICK SPLICE CONNECTORS!

5. Gets grounded with a ring terminal to the inner fender or radiator support on each side of the vehicle. They could also be run to the battery if you like.

We use a standard "Bosch Ice Cube" relay for the high beam feed, and the low beam feed. We use a 3 position toggle switch with "center off" to control the plow lights. Up turns on the plow light high beam, down turns on the plow light low beam, and center is off. We connect the power feed for it to "key on" power so the plow lights will go off when you turn the key off. Sometimes when there is a lack of spare key on circuits, we connect it to battery power instead. Once wired this way, when you turn on the plow lights, just turn off the truck headlights leaving the parking lights on only. You could plow with both sets of lights on, but the vehicle lights will likely glare off the back of the plow which is annoying. Also, it will be an additional drain on the electrical system that you don't need.

In this situation, terminal 87a is not used. When mounting relays, be sure connections are coming in on the bottom to help shed water. Adding an inline fuse or circuit breaker (based on wire gauge used) on the power wire from the battery is not a bad idea. Most of these relays are rated at 40 amps.

Toggle Switch ON-OFF-ON

SKU: ON-OFF-ON-SWITCH

Toggle Switch ON-OFF-ON

Toggle switch. 3 positions, ON-OFF-ON. Rated at 21 Amps @14v DC.

$5.50

 

Ice Cube ISO Relay

SKU: ICE-CUBE

Ice Cube ISO Relay

Bosch Type "Ice Cube" ISO Relay. Rated at 50 amps on/30 amps off.

$5.50

Manufacturer: Aftermarket

Truck-Lite Headlight Switch For Meyer plow lights by Truck-Lite

SKU: M08550

Truck-Lite Headlight Switch For Meyer plow lights by Truck-Lite

Truck-Lite Headlight Switch and Switch Hardware for Truck-Lite ATL lights used on Meyer plows and others over the years. 6 tabs on back of switch.

$18.00

Manufacturer: Aftermarket

Truck-Lite Headlight Wiring Harness

SKU: SBSTLHH

Truck-Lite Headlight Wiring Harness

OEM Truck-Lite Wiring Harness for ATL Truck-Lites. These fit Meyer (by Truck-Lite) and other manufacturers who used Truck-Lite ATL Lights over the years. Includes Left and Right Headlight Harnesses.

$60.00

Manufacturer: Truck-Lite

6 Pin Pigtail Loop

SKU: 6PIN-PIGTAIL

6 Pin Pigtail Loop

6 Pin Molded Connector Loop. 16ga wire. Cut in the center of loop to have two 6" pigtails. Perfect for repairing snow plow lights. DOES NOT MATE TO Truck-Lite plug. You must splice in both halves of this loop to repair a Truck-Lite plug.

$9.99

Manufacturer: Aftermarket

 

On the Meyer web site:

Original Instructions for Truck-Lite with 6 wire switch

Original Instructions for Truck-Lite with 12 wire switch

Original Instructions for Signal Stat Plow Lights

Original Instructions for Dietz Plow Lights

Supplement for Dietz Plow Lights

Meyer Nite Saber Wiring

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(973) 209-PLOW

Smith Brothers Services, LLC
3212 State Route 94
Suite 9
Franklin, NJ  07416
(973) 209-7569
sales@smithbrothersservices.com

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Author: Chuck Smith

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