74 duster electrical problems

I think having new wiring in these old cars is a good thing. But you need to make sure that everything is protected with a proper size fuse for to handle that circuit.

I am currently re-wiring one and also adding a separate marine fuse panel to protect things like the alternator, ignition switch circuit ,both fuse panel feed wires and any additional relays for lights, electric fans , etc.

Everything needs to be fused according to wire size capacity.
If you have things burning up they are not fused correctly.