kaz1961

Decided to go with a pedal kickdown switch for the TH400 transplanted into my 1980. My fusebox has a couple of slots marked ign. Could I just use a spade connector in one of those slots and run the wire to the switch directly to supply the 12v? Dont want to be Bubba with this so if there is a better way to do this please let me know.

'75

That should work, power to switch that closes at wot and sends power to trans solenoid.

7T1vette

You can do that, but I suggest that you install a 5 amp fuse in the line also. Not exactly sure what current that solenoid/switch in the tranny draws (probably less than 1 amp); but, you need a fuse to prevent the possibility that a dead short occurs in that line, when connected to un-fused ignition supply current.

454Luvr

I wouldn't use IGN for this. If the fuse blows, the motor dies. I'd tap off something less critical, maybe the fuse for the radio. You might also consider checking a wiring diagram for a '72 or '73 with the TH400 to see how the factory did it.

jnb5101

Check the wiring harness for an existing plug.

7T1vette

Adding a fuse AFTER the "IGN" pin on the fuseblock will not influence the engine at all if it blows.