Re: Power window master switch
Posted by HH56 On 2019/7/20 14:33:51
I don't know if you will find any new switches but there are probably some used around. There are two main causes for switch problems that have been found so far.
One is the plug that mates to the pins on the back of the switch has contacts inside the plug that bend or stretch and lose shape and contact with a pin. This is probably because of the pull of the wire bundle and the lack of fastening to the switch body.
The other and more common issue seems to be a relatively tiny surface area on the movable switch contact or "button" burns away because of the high motor current and the arc that develops as you let off the switch when the motor is stalled at top or bottom of travel. The contact surface is actually the small end of a rivet and as far as I know there is no repair that has been figured out or being done by anyone. I looked for a compatible rivet but did not find anything that was small enough or shaped properly. Trying to repair using silver solder to build up the surface I think would be very difficult if not impossible because the mounting piece is phenolic and can't take a high temperature.
To add to the problem is apparently Packard had two vendors or two versions of the switch. I have not compared them myself but another poster who had hoped to repair his switch with parts from another found his two switches were different and parts would not interchange. If you cannot find another good switch the parts are the same for each switch section inside the master. Two sliding "contact buttons" are used for each switch section. You could move the bad contact to a window not used often and swap a good piece for the drivers window. The 4 chrome visible pieces are held by a pin which can be pushed out of the switch body. Once the pin is out the chrome part can be lifted off and the "buttons" will then come out as well. There is a spring under each "button".
It was mentioned at one time that Cadillac might have used the same switch. Does anyone know if this is true. If so there is a Cadillac place that has some switch repair parts and if there is a chance Packard and Cadillac used the same internal parts maybe some kind of repair would be possible.
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One is the plug that mates to the pins on the back of the switch has contacts inside the plug that bend or stretch and lose shape and contact with a pin. This is probably because of the pull of the wire bundle and the lack of fastening to the switch body.
The other and more common issue seems to be a relatively tiny surface area on the movable switch contact or "button" burns away because of the high motor current and the arc that develops as you let off the switch when the motor is stalled at top or bottom of travel. The contact surface is actually the small end of a rivet and as far as I know there is no repair that has been figured out or being done by anyone. I looked for a compatible rivet but did not find anything that was small enough or shaped properly. Trying to repair using silver solder to build up the surface I think would be very difficult if not impossible because the mounting piece is phenolic and can't take a high temperature.
To add to the problem is apparently Packard had two vendors or two versions of the switch. I have not compared them myself but another poster who had hoped to repair his switch with parts from another found his two switches were different and parts would not interchange. If you cannot find another good switch the parts are the same for each switch section inside the master. Two sliding "contact buttons" are used for each switch section. You could move the bad contact to a window not used often and swap a good piece for the drivers window. The 4 chrome visible pieces are held by a pin which can be pushed out of the switch body. Once the pin is out the chrome part can be lifted off and the "buttons" will then come out as well. There is a spring under each "button".
It was mentioned at one time that Cadillac might have used the same switch. Does anyone know if this is true. If so there is a Cadillac place that has some switch repair parts and if there is a chance Packard and Cadillac used the same internal parts maybe some kind of repair would be possible.
Attach file:
(47.84 KB)
(100.45 KB)
(49.55 KB)
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