Quote:
Originally Posted by cwcarpenter98
Just so I make sure to get it right, how should I wire up the relay? I'm still new to wiring stuff, and I definitely don't want to get it wrong and screw something up
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To use the RY-12 relay for interrupting power to the HEI for the overdrive kickdown, you would want to make the following connections:
- Disconnect the power feed wire from the HEI distributor and re-connect it to terminal #1 on the relay.
- Run a wire from the relay terminal #2 to the HEI power terminal. (*)
- Connect a short jumper wire between the relay terminals #1 and #4. (**)
- Connect the overdrive "ground-out" wire (that originally went to the negative coil terminal) to terminal #5 on the relay.
- Leave terminal #3 unused.
(*) Note: Make this wire the same gauge (typically 12ga) as the one originally feeding the HEI.
(**) Note: This will result in 2 wires connected to the #1 terminal. To avoid a splice joining the 2 wires, there are special Packard/Delphi terminals available that will allow 2 wires to be crimped together into the same terminal.
And I know you're using an original overdrive relay, but for anyone else interested, to make use of the RY-12 as a substitute for the original OD relay, the connections are:
- Connect the fused power feed wire to terminals #1 and #4. (***)
- Connect the overdrive solenoid's power wire to terminal #3.
- Connect the control wire from the kickdown switch to terminal #5.
- Leave terminal #2 unused.
(***) Note: This double wire connection is not necessary with the original OD relay because it already has an internal connection between the relay's contact & coil.