Model T Ford Forum: Wiring Diagrams..rrrrrrrr! The T lights are the single biggest load on the system so that is likely why Ford wired it with the lighting getting higher priority in the wiring resistance tree of connections. BTW - the CORRECT fuse for a 20 amp system is sized typically at 1 times the carry current so if the carry current is 20 amps - a correct fuse would be 25 amps. 1919-1925 Ford Model T TT Commutator Wiring for vehicles w 1919-1925 FORD MODEL T TT Commutator Wiring for vehicles w/Starter 1926 1927 TT - $46. Please zoom in on all 7 photos to get a better look at what you are buying. They are a large part of the description. What you see is what you will get. PLEASE READ DESCRIPTION and Check all the shipping options. Here we have a Ford Model T, commutator wire harness.
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