Date: Thu, 10 Feb 2000 20:40:24 EST
Subject: (rx7) Fog Lights as DRL's
Objective: Modify the '93 RX-7 Touring Model fog-lights such that they automatically turn on when the engine is running and turn off after the engine is shut off. With the J.C. Whitney low-voltage controller, the Fog Lights operate at 9 volts to prolong bulb life. After this conversion, the fog-lights cannot be operated by the console mounted switch. According to the product brochure, this conversion meets Canadian DRL Standards.
This mod can also be applied to after-market fog lights. If you are installing the fog lights with this controller you won't have to run a wire to a cockpit switch or use an electrical relay (big bonus). Just follow these instructions and use the white (hot) wire from the DRL controller to supply the 9 volt power to both fog lights.
You could also get the 12 volt DRL controller and hook it up to the white parking lights in the front of the car to use them as DRLs. Just cut the hot wire at the lights and connect the power wire from the DRL controller box.
Some states don't allow fog lights to be on at the same time as your bright lights so this mod wouldn't really be legal but it's easy to get around. Just disconnect the DRL controller's power wire (or remove it's fuse) when you take it in for inspection and tell the guy the fog lights don't work. After the inspection hook them back up.
Note: The DRL-Controller described here was manufactured by Hamsar Diversco,
Inc., 5320 Downey Street, Burlington, Ontario, Canada, L7L 6M2,
(905) 332-4094, and is their Model 70986 "Visi-Light". Since J.C.
Whitney can switch suppliers, it is possible that another manufacturer's
controller will install differently, particularly with respect to wire
colors. Be careful.
Drill two pilot holes in the mounting bracket and screw the DRL-Controller to it with sheet-metal screws.
Install the DRL-Controller & Mounting Bracket in car - at this point the
DRL-Controller is attached to the mounting bracket, and this assembly
can be installed with a single bolt if you used at the location described
above. I put a layer of electrical tape between the bracket and the car to
Green: Wrap Around Spark Plug Wire Black: Ground Connection Red: Fused, Hot From Positive Battery Terminal to DRL-Controller Orange: Hot to Hi-Beam (not used in this mod) White: 9-volt Hot (labeled "Low Beam")
For after-market fog lights connect the DRL-Controller's white (hot) wire to one side of both fog lights and ground the other fog light wire (ground wire is normally black).
Also, the white wire from the DRL-Controller was too short to reach the Driver's side fog-light. Add several feet of appropriately sized wire and run it behind the bumper to the fog-light. Remove the fog-light housing with a 10mm socket; it will now be connected to the car with two wires, one black and one white. With a plastic splice connector or other appropriate means, connect the DRL-Controller WHITE wire to the BLACK wire at the fog-light. (See note below.)
Start Engine See if fog-lights come on. If not, check the fuse. If it has
blown, check the functions of the black and white wires connecting to
the fog-lights. Also make certain that the console fog-light switch has been
disconnected. At this point your fog-lights should be fully functional
Note: The installation described above should NOT work if the wiring diagram shown on page E-1 Section Z of the Shop Manual is correct. Page E-1 shows the fog-light ground wire to be Black, and the hot wire is shown as White. However, when I initially installed it this way, my DRL-fuse blew when I started the car, indicating a dead-short. So I then treated the Black wire at the fog-light as the "hot" wire and this solved the problem. The only way I understand this could happen is if the Shop Manual reversed the White and Black wires in the diagram. As I have only a rudimentary electrical knowledge, comment would be appreciated by an electrical engineering types.
Date: Thu, 10 Feb 2000 20:40:24 EST
I purchased the DRL controller at JC Whitney, the catelog place. Their telephone number is 1-800-837-4227. Call them for a catelog (their part numbers are always changing.)
Note: Also see the Fog Light Rewiring Page for info on how to rewire the fog lights so they will come on w/o the headlights.