4 way flashers from Gadget

[markw]

I did the 4-way flasher mod from Gadget's website on my 04 1500 nomad. I chose to mount the flasher in the headlight and use the always hot accessory wire under the tank and a DPDT switch to connect to the turn signal(s) green and grey in the headlight. The lights all work fine except the turn signal indicator. Gadget said his indicator does light up.

I noticed that the indicator would light if I just hooked up 1 side of the 4-way circuit and thought that there must be a feedback voltage preventing the indicator from coming on with both sides hooked up.

Would a diode help to light this indicator? Any electrical gurus out there with an idea?