Re: Dad's 5677A
Posted by HH56 On 2020/12/5 22:03:26
It is really hard to say what someone might have done with the TL wiring. Probably not having a complete schematic has made many do a Rube Goldberg thinking they will solve a malfunction or work around a faulty switch. Here is the complete 56 diagram showing all contacts in the black boxes just in case you missed downloading one posted in other threads.
This diagram also shows the optional 56 manual switch as Packard designed it to add into the existing wiring without bypassing the limit switches and to automatically disconnect the power to the automatic level control box to disable it when manual is used. Without the optional manual switch in the circuit the light green wire is continuous from the brake switch to the under dash on/off switch and the extra two wires in a separate loom to the control box are not present.
The VW 3 terminal switch is an option but there have been some that report issues with those having a short life also. One advantage of the 2 terminal switch and relay approach is the 2 terminal switches are inexpensive and can be found at almost any parts store. Even if those have a short life too it is approx $15 or less to replace from the corner store instead of trying to find a specific and more expensive 3 terminal. You can buy premade kits which just plug in from some of our vendors and regions or you can make your own with a switch and inexpensive relay and socket.
Another approach some have used to eliminate hydraulic switch issues completely when using silicon fluid is replace the hydraulic switch with a mechanical switch operated by the pedal arm.
Attach file:
(90.95 KB)
(56.48 KB)
(79.42 KB)
This diagram also shows the optional 56 manual switch as Packard designed it to add into the existing wiring without bypassing the limit switches and to automatically disconnect the power to the automatic level control box to disable it when manual is used. Without the optional manual switch in the circuit the light green wire is continuous from the brake switch to the under dash on/off switch and the extra two wires in a separate loom to the control box are not present.
The VW 3 terminal switch is an option but there have been some that report issues with those having a short life also. One advantage of the 2 terminal switch and relay approach is the 2 terminal switches are inexpensive and can be found at almost any parts store. Even if those have a short life too it is approx $15 or less to replace from the corner store instead of trying to find a specific and more expensive 3 terminal. You can buy premade kits which just plug in from some of our vendors and regions or you can make your own with a switch and inexpensive relay and socket.
Another approach some have used to eliminate hydraulic switch issues completely when using silicon fluid is replace the hydraulic switch with a mechanical switch operated by the pedal arm.
Attach file:
(90.95 KB)
(56.48 KB)
(79.42 KB)
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