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Headlight - High Beam/Low Beam

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noah michael gresham

Farmall Cub
Joined
Mar 16, 2019
Messages
1
Points
1
Hi Everyone,
My 1966 800A has been having occasional headlight issue for last year .. now permanent. Low beams do not work but High beams do work. Bulbs have been replaced and still no low beams. Ideas on how to efficiently trouble shoot.

Thanks in advance,
Noah
 

winchested

Dreams of Cub Cadets
Joined
Oct 12, 2016
Messages
4,958
Points
113
Location
Delhi, ON, Canada
Check your grounds and check your headlight switch for power on the low beam side.

Sent from my SM-G870W using Tapatalk
 

Dana Strong

Lives in an IH Dealership
Joined
Apr 4, 2008
Messages
6,471
Points
113
Location
Sunnyvale, Ca.
Ideas on how to efficiently trouble shoot.
Power goes from the headlight switch (circuit #16) to the dimmer switch on the floor, then through the bulkhead connector (both high & low circuits #17, #18) to the headlights. The headlight ground wire serves both sides.
The easiest place to check is the dimmer switch and its connector. If it shows power going out on both circuits, the problem is either at the b. connector or the wiring downstream.
 
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