Unless you have a switch that integrates the brake lights into the system you must run separate lights. You can not just tie the signal into the existing brake light circuit if it is not designed for it.
Original 6V truck. I assume if I try to tie in to the brake light wire, when the signal is working, both brake lights will light up as I think they are tied in together at the brake light switch.
What about changing the running light socket on the rear to a double filament? OR, should I return the lights and go after something aftermarket?
