Locating Cold Side Of Stop Light Switch On 1994 Dodge Ram 1500 For Tow-Pro Liberty Installation
Question:
I’m working on the wiring plan to connect a RedArc Tow Pro Liberty RED24FR, with the Universal Wiring Harness for Redarc Tow-Pro Trailer Brake Controllers RED69FR in my 1994 Dodge Ram 1500. My truck doesn’t have the factory Trailer Tow System, but does have a 7-way connector with all the pins operating correctly except for pin #2 for Trailer Brakes. But the unterminated blue ‘Electric Brake Provision’ wire is present at the instrument panel and runs to pin #2, so I plan to connect that for the blue wire of the RED69FR harness. My question: where’s the correct place to connect the red wire of the RED69FR harness? The installation document has strict requirements for this connection: This connection point must: • Provide ‘Start Battery’* voltage output while the vehicle brakes are applied. • Have 0 volts output while the vehicle brakes are not applied • Accept battery voltage input when the brake controller manual over-ride is operated and illuminate at least the trailer brake lights. • Accept the battery voltage input as above without causing any damage, spurious vehicle operation or erroneous fault indication. A relay should not be installed to drive the red wire as this would prevent the override feature from working and may introduce dangerous voltage spikes. * Start Battery voltage output means, directly from the Start Battery and within 0.4V of Supply Black wire voltage. And the warning from section 2.2.4 of the installation document seems relevant: Brake Signal Source - Brake Pedal Switch Sourcing the brake signal at the brake pedal may only detect braking events when the brake pedal is depressed and the switch activated and not brake applications activated by other on board systems such as AEB. Note: Only connect to the brake pedal switch if specified by the vehicle manufacturer. I have the wiring diagrams for my truck, but nothing is jumping out as the obvious right answer. Any hints? Thanks!
asked by: James F
Expert Reply:
To install the # RED24FR on your 1994 Dodge Ram 1500 the red wire on the # RED69FR needs to connect to the cold side of the stop light switch. This will be the wire that only has power when brake pedal is pressed and should be located above the brake pedal. Using a circuit tester like # PTW2993 will allow you to find the correct wire to connect to.
I do not have any information on wiring color or the specific location of the wire since we have not performed this installation on your truck. Even with that information, or your wiring diagram, we recommend testing just to be sure since it doesn't always match between vehicles.
If for some reason you are unable to locate this wire you could also use the Roadmaster Universal Stop Light Switch Kit # RM-751000 to give you your brake signal. This is often used on vehicles where the wire is hidden or unable to be used for brake controller installation.
Products Referenced in This Question
Universal Wiring Harness for Redarc Tow-Pro Trailer Brake Controllers
- Accessories and Parts
- Trailer Brake Controller
- Wiring Adapter
- Redarc
more information >
Roadmaster Universal Stop Light Switch Kit
- Tow Bar Braking Systems
- Stop Light Switch
- Roadmaster
more information >
Product Page this Question was Asked From
Redarc Tow-Pro Liberty Brake Controller - Dash Knob - 1 to 2 Axles - Proportional
- Trailer Brake Controller
- Proportional Controller
- Electric
- Electric over Hydraulic
- Automatic Leveling
- Dash-Mounted Knob
- Hidden
- Up to 2 Axles
- Indicator Lights
- Redarc
more information >
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