Need help With combination light wiring

RTR · Oct 20, 2015

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).

the tractor vet · Oct 20, 2015

Well your light switch should have three clicks from the off , first is dims and red light on the read along with dash, next is bright head lights and WHITE work light on the rear , next click should be bright headlights and RED light on the rear .

elevatorman724 · Oct 21, 2015

Check voltage for red light at light switch with test
light or meter referenced to battery ground and work
your back to rear light checking connecting plugs
along the way good luck

RTR · Oct 21, 2015

My light switch has 4 positions. From the left side, Position 1 = OFF, Position 2 = dash light and Dim headlights, Position 3 = dash light and bright headlights, Position 4 = dash light, bright headlights, and bright rear work light

As far as I can tell the wiring to the back is just 2 wires and they are encapsulated in a large rubber conduit all the way from the dash back to the fender. Getting the continuity buzz tells me that the connection is continuous. I will check voltage.

Need help With combination light wiring

RTR

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the tractor vet

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elevatorman724

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RTR

Well-known Member

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