Alternator wiring diagram 1981 f150 - Fixya wwwa››Cars & Trucks›Ford›F-150›1981 Ford F 150I am using 1993 engine HO 302 electronic in a 1981 f150 usinng the 81 intake. the alternator has different wiring hookups i am using the serpintine belt pulleys so can use the 93 engine brackets. i need to know how to pigtail 93 plugin into the alternator and the plugin on the otherside for a 81 f150 wires for the 93 are green with red stripe and a yellow one, there only two on this plug SOLVED: 1981 ford truck alternator schematic - Fixya wwwa›Forum›Cars & Trucks›Ford›E-3501981 ford truck alternator schematic We have a 1981 1 ton ford truck that previous owner has rewired after burning - Ford E-350 question. Search Fixya If your Ignition switch is bad or if the power is not going to the Alternator because of wiring, then the Alternator will not put out current. I noticed the year of your truck is a 1981.