BATTERY CONNECTIONS

[savage54]

I bought two interstate batteries for the 97 dodge today. Cleaned up the connections, and had to fix two of the smaller wires, they look like they are fusible links, put new ends on them (crimped and then soldered) then.I wanted to know what they actuality operate or power.I'm assuming the larger black wires that go into one connector, is for the grid heaters.
Thanks Dave

 

[Signal73]

The 2 black ones are for the grid heater, not sure about orange and blue. For the record my orange is currently blown and truck runs fine

 

[BigPapa]

Orange powers the Fuel Heater Relay.

Blue powers the Fuel Shutdown Relay.

 

[savage54]

Thanks, Dave