Ignition repair on a Ferguson tractor

摘要

I recently assisted a friend to repair the ignition system on a Ferguson tractor which has a positive earth electrical system. The ignition coil had failed and a new "modern" one was purchased which is designed for vehicles with negative earth. Is it possible to use a second input selector board from your latest preamp (Silicon Chip, January 2012) to switch video? That is, just "daisy-chain" the ribbon cable and only equip either the left or right channel with sockets? (C. H, via email).