tford911

ok so this is kinda hard to explain. i am a firefighter and want to make it so my windshield mount off road lights are also warning lights for when responding to calls. i wired them up like the diagram below shows. i used a simple 12V alternating flasher, and a light up 3 position switch.
position 1 - flashing
position 2 - off
position 3 - steady

when i turn the switch to steady they both light up
when i turn the switch to flash they both light up no flash

is there a relay or something somehow to mount to prevent it back feeding bypassing the flasher? (the blue dots)

help please

PS. yes the flasher works i have tested it along with the switch

SilverShift

from my electrical knowledge, I believe you would have to put in a one way diode in where the steady wiring is. Doing that will prevent power from going back to the relay. Should do the trick. Let us know how that goes!

tford911

any idea where to get one?

mikekeeper

Radio Shack.

OverKill

I don't see a relay in your wiring diagram. I have been told and all the light kits I have bought had relays. Not sure what they do.

JK-Ford

Agrreed that the problem is feed-back. The flasher system is feeding back through the "maintained" wiring. Diode(s) would be the simple fix. You need one for each light. When one flashes ( left ) it feeds power through the extra wires to the other fixture ( right ) making it appear that both fixtures are activated.

tford911

so on another forum i have members telling me that i need a double throw switch i can figure out how it works does any one by chance have a diagram showing how to wire one of these up?

this is why im not a electrician

JK-Ford

Well I am. And a SPDT sw will not work. You need a DPST ( double pole single throw ) switch. The switch will have 2 primary terminal. And 2 secondary terminals. Connect 12V to both primary terminals. And connect 1 light to each secondary terminal. This will correct the problem.