6. Cylinder duster is now a 340 ignition issues wants to start when you let up on the key
This shows
both the heavy duty alternator wiring and the standard wiring.
Should be just one 16 gage fusible link connected between the battery and the ammeter.
For the J1 to get power, the only connection on the diagram we've identified is the fusible link at Z on the bulkhead.
If that's correct, R6A must remain connected to either R6, or R6C and R6D, or all of them.