Hey guys I'm having trouble trying to figure out this combination rear lite. This light is on my international 424 diesel tractor and is just like the combination lite found on a late Farmall 140 where it has the red taillight and work light together in 1 bulb. This light has the three prong connector that square shaped. I have a brand-new aftermarket original style light switch, put in new bulbs in the light, verified all my grounds are contacting. and I cannot get the red tail light to turn on. The work light portion comes on at the last switch position. I can get the red lite to come on when I jumped a wire from the connection point to a hot battery. I also checked the continuity of the red light wire from the connector all the way back to the light switch where it is plugged in. My multimeter buzzes when the continuity is checked verifying that is the correct wire that is plugged in and it is a continuous connection. I've also wiggled the connection point at the light hoping that would solve it and nothing seems to work to get it to burn in any of the four positions on the light switch (three working positions).