Re: Torsion Level System
Posted by HH56 On 2021/9/25 18:14:50
Here is the official info on how to use the 56 switch on a 55 but it is odd the way Packard changed the colors on the conversion harness. The harness colors are the same as 56 colors and hooking up color to color at the switch would not work without additional jumpers on a 55. The three single center terminals, yellow, green, and pink are the three active terminals so match the colors in the old harness to those terminals.
The double terminals, orange and blue at each end are not connected to anything in the switch and are used only as tie points so the individual 56 limit switches can be connected to the solenoids with minimal effort. The limit switches complete the circuit from the single terminals to the double terminals so would have to be replaced with jumpers to use the conversion harness colors.
Note that even NOS switches can have an oxidation buildup on the contacts just from sitting on a shelf. The switch may be OK but if it acts up and seems like it will not work you will need to remove the rivets and cover to access and clean both sets of contacts. Be very gentle with the dual sided contact on the end of the bimetal strip and be careful not to snag one of the heater wires.
Here is the 56 diagram for the TL circuit so you can compare to the 55. Yellow is the 55 "A" terminal and pink is the 55 "B". Also posting a very nice drawing someone did showing the 56 switch in the 55 circuit.
Attach file:
TL.jpg (114.83 KB)
56TorSwitch1.jpg (130.47 KB)
56 unit on 55 car.jpg (193.40 KB)
The double terminals, orange and blue at each end are not connected to anything in the switch and are used only as tie points so the individual 56 limit switches can be connected to the solenoids with minimal effort. The limit switches complete the circuit from the single terminals to the double terminals so would have to be replaced with jumpers to use the conversion harness colors.
Note that even NOS switches can have an oxidation buildup on the contacts just from sitting on a shelf. The switch may be OK but if it acts up and seems like it will not work you will need to remove the rivets and cover to access and clean both sets of contacts. Be very gentle with the dual sided contact on the end of the bimetal strip and be careful not to snag one of the heater wires.
Here is the 56 diagram for the TL circuit so you can compare to the 55. Yellow is the 55 "A" terminal and pink is the 55 "B". Also posting a very nice drawing someone did showing the 56 switch in the 55 circuit.
Attach file:
TL.jpg (114.83 KB)
56TorSwitch1.jpg (130.47 KB)
56 unit on 55 car.jpg (193.40 KB)
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