Lucas 17acr Alternator Wiring Diagram Oct 20, · Lucas Alternator Wiring Diagram Leila Hoover Lucas a alternator rebuild,reg rectifier wiringall tractors and vintage cars. 1 wire vs 3 wire alternator plus other tips for classic. Lucas 17ACR alternator diagram Saturday, 18 September General Hot Products. 3-Wire Alternator Wiring Instructions | It Still Runs 3-Wire Alternator Wiring Instructions by Stephen Benham . Alternators provide an important duel function: They produce electricity to charge your battery and operate the electrical equipment in your car. Alternator wiring is easier than in the past due to the use of plugs and sockets which are usually different sizes ensuring you wire your Lucas 11AC alternator guides The wiring changes affect the alternator harness, the 6RA harness, and the 3AW harness. First, the AL lead on the alternator must be jumpered to the F+ lead. This will cause the alternator to be self-energized by the trio, rather than powered by the battery. Accomplish this with a pigtail, as illustrated.