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hope you guys can help, got the j. osborn wiring dia., not clear on a couple of things.
what is a tcs relay & solinoid ?, these wires are just hanging. whats the brown wire
by itself coming thru firewall near center.
what color is the tach lead and are the any
mods required on it for a hei, Thanks Rob...
 

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Transmission Control System, most people remove these. There was/is a temp sensor on the right side of the block, two relays on the firewall behind the distributor, a black wire goes to the transmission. Supposedly controlled shift points or some such.

The brown wire coming through the firewall is probably the tach lead (I think).

HEI requires a full 12 volts, if your wiring is original then the coil connection is a balast resistor wire that drops to 9 or so, you'll want to replace this with a full 12. You also won't need the yellow wire that comes up from the starter.

Others will chime in with more information...

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Cecil Hawkins
San Diego, CA
1971 GMC Sprint

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I think "tcs" is for temperature controled spark
the solenoid cuts off vacuum to the distributor under certain conditions

The tach wire is the brown wire coming through a grommet in the firewall by itself

All you need to do to convert to HEI is run a wire to the "BAT" terminal on the dist cap that supplies 12 volts when the ignition switch is in the "on" and "start" posittions and has no power when the switch is in the "ACC" position

you can eleminate the yellow bypass wire that is running from the starter to the coil's "+" terminal because it is not needed with the HEI
 

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How about "Transmission Controlled Spark". These systems are a little difficult to keep functional and parts are hard to find. A straight hose from the carb to the distributor bypasses the system.
 
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