Working on a 58 GMC 1 ton Napco and installed a new turn signal switch. All lights working correctly but in the rear brake lights are activated by turn signal switch and not the brake pedal(new switch installed 2018). When I unplug the white wire out of the switch the brake lights do not come on with the switch or the pedal and the turn signal lights work fine. Any ideas? Thanks Pat


58 1 ton Napco
59 1/2 ton Napco
58 1/2 ton Napco
55 1 ton 9’ bed
58 3/4 ton stepside
55 LCF boom truck
(3) 57 2 tons