Instructions
Attention Installers
It is the final responsibility of the installer of headlight flashers to determine their compatibility with the
vehicle make and model in which they will be installed. Incorrect wiring of headlight flashers could result
in costly problems or even permanent damage to the vehicle’s computer module.
NOTE: Do not install any SHO-ME® headlight flashers on 2000 model year or newer Dodge Durangos or Dodge Dakotas. Our flashers are not compatible with these vehicles and may lead to the failure of their computer systems.
CAUTION!
This flasher MUST be wired through the ignition circuit. DO NOT wire directly to the battery.
This flasher is designed to flash high beam headlights on vehicles with negative ground headlight systems. This flasher produces an alternating simultaneous double flash effect using the vehicle’s existing high beam headlights.
Before installation of this flasher, check the existing wiring of the vehicle headlights. The ground wire of the
headlights must be grounded at all times for this flasher to operate properly. Check BOTH headlights for ground
while the vehicle is off, on, headlights on and off, and while daytime running lights are active (if applicable). If the
ground wire for the headlights is not at ground potential at all times, find the reason and a remedy before installation
of the flasher. If there is a daytime running light module that is removing the ground from one or both lights, a relay
may be installed to temporarily disable the running light module anytime the flasher is to be operational (i.e. connect
the relay to the same switch that turns on the flasher). (Vehicle manufacturers generally provide a way to disable
the running lights via the power to the running light module, emergency brake light switch, etc.) Or if the
circumstances of the installation permit, disable the running lights permanently. Note: If you’re not able to disable
running lights yourself, take the vehicle to a dealer who can disable them for you.
In addition, ensure that the vehicle is not using “Ground Switching” or “Positive Ground” to control the
headlights. Ground Switching means that the headlight “common” terminal is connected to + 12 V, and the
headlight is activated when the dimmer switch (or headlight relay) connects ground (0V) to the high OR low beam.
If the vehicle has “Ground Switching”, use Model 03.W3031 instead.
As the flasher is being installed, ensure that the output of the flasher is the only wire going to the positive high beam wire on each side. The wire that originally went to the driver’s-side high beam can generally be connected to the Override Terminal of the flasher (rather than going all the way back to the actual dimmer switch).
Use a minimum of 16 ga. wire for the headlights, override and positive input of the flasher. If long runs of wire are
required (greater than 6’) use a larger gauge wire. The ground wire may be 18 ga. MINIMUM.
When selecting a location to mount the flasher, keep in mind that the life of any electronic device is directly
dependent on the temperature in which it is operated - the cooler the unit, the longer the life. Select a mounting
location that is away from sources of extreme heat.
Operation
When the flasher is installed properly in the vehicle, the headlights will flash any time +12V is applied to
the Positive terminal of the flasher. Any time +12V is applied to the Override terminal of the flasher, both headlights
will come on steady. This function will “override” the flashing function of the flasher, allowing normal use of the high
beam lights.
