I just rewired my '49 Chevy 3/4 ton Step Van. The way I did it is I ran a 10 gauge wire from battery terminal on Solenoid to the D (Discharge) side of ammeter and a 10 gauge wire from D to St on ignition switch. Then with the same gauge wire I ran from bat. (battery) on ignition switch to C (Charge) side of ammeter. My ignition switch has 4 terminals (Bat., Acc., St., & Ing.) St. is in center with the others in a triangle shape. This worked for me.
