Re: 1951 Trunk light issue
Posted by HH56 On 2020/9/27 17:17:57
There is a small switch inside the light assy that is not making contact. 55s have a rolling ball but 51 is a question of whether the switch is mercury or a rolling ball. In either case one or both contacts have most likely oxidized and the ball or mercury cannot complete the circuit. Sometimes vigorous shaking will knock the oxidation off but oftentimes it has become too thick or solid to budge and some kind of drastic action is needed. If it is a rolling ball often the housing end is pressed on and with some careful work can be separated so the ball and inner contacts can be cleaned but if it is mercury then that is in a sealed glass capsule and not much can be done other than replace it with something else.
I don't remember who did the disassembly and posted the exploded view but it shows a typical light assy that used a mercury switch as was on pre 51 models. The repair is one that I did on my light using a modern tilt switch. The tilt switch was obtained from a shop that does theft and burglar alarms for cars but I believe Amazon also has something similar.
I removed the old mercury capsule and replaced it with a plastic tube which is used as a spacer and replacement for the missing capsule. Spacer is also a means to pass and hold a wire from the tilt switch which needs to be formed into a new contact for the bulb. The tilt switch was mounted on a phenolic plate above the light assy and is out of sight. The plate is held in position by the light assy mounting screws but it is not really necessary if you want to just splice the wires together and find another way to mount the new switch. In this one, the terminal and plate is used as a convenient connection point for the new switch with the original wire that connected to the socket now going to a flat head brass screw recessed in the new phenolic insulator plate with the head also protected by some tape so it cannot touch the metal housing. The wire out of the new switch goes thru the spacer and end is soldered into a new center bulb contact.
Attach file:
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I don't remember who did the disassembly and posted the exploded view but it shows a typical light assy that used a mercury switch as was on pre 51 models. The repair is one that I did on my light using a modern tilt switch. The tilt switch was obtained from a shop that does theft and burglar alarms for cars but I believe Amazon also has something similar.
I removed the old mercury capsule and replaced it with a plastic tube which is used as a spacer and replacement for the missing capsule. Spacer is also a means to pass and hold a wire from the tilt switch which needs to be formed into a new contact for the bulb. The tilt switch was mounted on a phenolic plate above the light assy and is out of sight. The plate is held in position by the light assy mounting screws but it is not really necessary if you want to just splice the wires together and find another way to mount the new switch. In this one, the terminal and plate is used as a convenient connection point for the new switch with the original wire that connected to the socket now going to a flat head brass screw recessed in the new phenolic insulator plate with the head also protected by some tape so it cannot touch the metal housing. The wire out of the new switch goes thru the spacer and end is soldered into a new center bulb contact.
Attach file:
(95.42 KB)
(110.06 KB)
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