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I know a lot of folks think electrical systems are voodoo but a systematic approach will easily resolve this problem. Get some alligator clip jumpers. remove each conductor you think goes to a light. Connect using the jumper to the battery. What lights up? Mark the cable. Go through all of the suspect circuits and ID them. Now connect them to the right fuse.
In electrician terms one side of the fuse is called line and the other load. The load side goes to the lamp, the line side goes to the switch. The switch could be the actual switch on the dash or the a relay contact. Leave the line side be. If you remove the line side you’ll have more problems. Once you get the loads in the right spot and it is verified by using the switch, mark the line side too.
I found the schematic drawing 90% accurate when rewiring my car. The wire colors were mostly correct. The complication with the wiring on my car is Porsche uses the fuse block as a splice point. There are conductors that are not fused but are cross connected using the line side of the fuse block. It makes it a bit difficult to grok at first. If the harness is unmolested the conductor colors are a big help in ID the circuit
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1966 912 to 2.7 Frankencar
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