1975 Ford F100 Ignition Wiring Diagram
Adding Lights or Electrical Devices to Ford Light-Duty Trucks The following information is reproduced directly from the 1970 Ford Body Builder's Layout book (Vol. 70 HTM2-L2). The information is applicable to all '67-'72 trucks. 1) The headlamp switches on all 1970 Ford trucks (except "W" models) employ two integral circuit breakers, one 12-amp for the headlight circuit and one 15-amp for auxiliary circuits. Connections to any point in the circuits controlled by the headlamp switch will be on the auxiliary circuit breaker, except connections to the #12 circuit (headlamp hi-beam, green wire/black stripe), the #13 circuit (headlamp low-beam, red wire/black stripe) and the #15 circuit (feed wire to the the