65amp wiring/trouble shooting

A little more information about "the red wire you asked about." From the factory service manual, starting from the B post on the starter relay - A1B 10R connects to fusible link A1C 16DBL which enters into bulkhead connector J. Then color changes to red A1 D12R on dash side of firewall which is capped off near ammeter. This wire is capped off because its not used with the 60 amp option.