Got a new Truck (new to me)
How much rewiring do you have to do in order to ditch the TBI for a carb and electronic ignition? Get an old wiring diagram for the ignition and just do that? Does the old TBI brain over behind the battery have to stay hooked up to run other stuff? When I do the Magnum swap in my truck, I have every piece of under hood wiring, fuse box & computer. I have a wiring diagram to hook up the 4 or 5 wires on the Magnum stuff to make it run. I'm hoping the old TBI ECU doesn't do anything with stuff like heater/AC, lights, charging circuit, etc.
These are all good questions. I am figuring things out as I go.
To start with all the TBI stuff was removed to clean up and paint the top of the engine, had all the TBI harness disconnected at every connection on the engine.
Then put the 4 bbl and points distributor in. No crank, everything was dead.
First thing was to hook up all the common grounds from harness and engine block to a good ground on the block (coil stand bolt hole).
That helped with things starting to come back on. There was one large 8 spade coupler in the harness that needed to be plugged back together with its mate, then the engine would crank with the key.
Then plugged in the electrical connector to the oil sending unit, now I have a working oil pressure factory gauge and idiot light besides.
Have headlights and 4 way flashers, think my turn signal switch in the column is shot though.
So Yeah, one step at a time working through it.
Here in Florida I am just going to use a manual heat control valve on the heater hose, and ditch the factory one with all the exccess vacuum lines all over the engine.
Then at the end will look into the AC to see what needs to be plugged in to get that working as it is all there and the system is still sealed.
So far so good.
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