In Reply to: 641 wiring diagram posted by Jim on August 24, 2020 at 16:36:58:
Where have you looked for wiring diagrams? Have you tried your Essential Manuals? They are very valuable tools if you don't have them. You know the OEM Ford electrical system is 6V/POS GRN right? If you have done a 12V switch out job, there are specific things that get changed over. Manuals have the original wiring diagrams with original wiring harness color codes listed. Use for reference only - new wiring harnesses aren't all the same colors nowadays. Use a VOM set to continuity, not a test light. Start here...
FORD 600/800 TRACTOR IGNITION TIMING & ELECTRICAL WIRING:
FORD 600/800 ESSENTIAL OWNER/OPERATOR/PARTS/SERVICE MANUALS: