headlight polarity

[KB7TCV]

new h3 to be here this week. does anyone know if the headlights on the h3 are postive side switched or ground side switched. am Search & Rescue volunteer need to know so i can see if i need to order a new headlight flasher.wig-wag kit (police alternating headlights)

[KB7TCV]

new h3 to be here this week. does anyone know if the headlights on the h3 are postive side switched or ground side switched. am Search & Rescue volunteer need to know so i can see if i need to order a new headlight flasher.wig-wag kit (police alternating headlights)

[Planohummer]

The headlamp relay receives battery positive voltage directly from the battery. The BCM supplies a ground signal to the headlamp relay for normal headlight operation. The BCM also supplies voltage to the beam select relay coil for high beam headlight operation. When the driver places the headlamp switch in the ON position and the dimmer switch is in the low beam position, the headlamp relay supplies current flow through the left and right low beam headlamp fuses to both low and high beam headlamps. Both low beam headlights are grounded through the beam select relay. When activated, the dimmer switch sends a ground signal to the BCM in the high beam position and a momentary ground signal in the flash-to-pass (FTP) position from G106. The BCM then energizes the beam select relay which switches the headlamp grounds from the low beam headlight bulbs to the high beam headlight bulbs illuminating the high beam headlights. With the headlights in the low beam position, the high beams may be momentarily turned ON or flashed by activating the FTP portion of the switch.

[f5fstop]

That should be an interesting hookup, since like Planohummer explains, the BCM controls both high and low beam voltage as well as ground circuits.
Does the wig-wag flasher leave the low beams alone and just flash the high beams, alternating from side-to-side?
If so, it should not be hard to install the wig-wag via the hi-beam ground circuit (pink wire) into the HI/LO BEAM Relay #70. You will have to install in a ground circuit, since the voltage is constant and does not change with hi/lo beam selection.

[KB7TCV]

flasher kit flashes high beams only. leaves low beams for driving. here is a link to the instructions for the flasher kit i currently have
headlight flasher diagram (http://www.galls.com/DOCUMENTS/FS001_3-Pattern_Flasher_Positive.pdf)

[f5fstop]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by KB7TCV:
flasher kit flashes high beams only. leaves low beams for driving. here is a link to the instructions for the flasher kit i currently have
headlight flasher diagram (http://www.galls.com/DOCUMENTS/FS001_3-Pattern_Flasher_Positive.pdf) </div></BLOCKQUOTE>

Won't work on the H3 since the power supply to both hi and lo are supplied from the relay via one wire. Need something that will cut into the ground circuit for the hi beam.
Send me your email and I'll forward on the wiring schematics for the external wiring.
Just PM me with the email address.

[KB7TCV]

found another flasher kit that i think will work. this is the same flasher kit that is listed for the colorado/canyon. Headlight Flasher Ground Switch (http://www.galls.com/DOCUMENTS/FS003_3-Pattern_Flasher_Negative.pdf)

[f5fstop]

Looks good, the Colorado has basically the same type of headlamp control via the BCM. One BCM controlled relay supplies power to high/low, and another supplies ground to both. So, looking at the Colorado schematics, and knowing the H3 schematics, it should work.