Re: Headlight switch. has anyone experienced this?
Posted by HH56 On 2017/5/4 16:30:18
The dash lights are fed from the headlight switch doubled tail light terminal via a short jumper wire to the ceramic potion of switch. The rheostat is embedded in the ceramic. Output to the dash lights is via another wire from the rheostat center double terminal to a splice and on to the individual bulbs in the cluster. The second wire of the double terminal goes to the Ultramatic indicator light. There is a terminal on the opposite side of the ceramic which grounds when knob is turned to the left stop and is the switch for the front courtesy lights. No fuses -- the only protection is from the headlight circuit breaker.
The 51-6 switches have had issues with oxidation and corrosion building in the stacked up wiper contact plates located around the shaft in the center of the ceramic. Under the rivets which complete the connection between the metal bases of the terminals and the wiper parts or resistance wire is another area -- particularly if a terminal is slightly loose. If your wires are installed on the correct terminals and intact, I would not be surprised if corrosion was the issue.
If you have a switch that has sat either on the shelf or unused in a car for years, high resistance and poor contact at the wiper plates could be preventing the lights from working. Some contact cleaner and vigorous twisting of the knob may help but if corrosion is under the rivets it usually comes back.
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The 51-6 switches have had issues with oxidation and corrosion building in the stacked up wiper contact plates located around the shaft in the center of the ceramic. Under the rivets which complete the connection between the metal bases of the terminals and the wiper parts or resistance wire is another area -- particularly if a terminal is slightly loose. If your wires are installed on the correct terminals and intact, I would not be surprised if corrosion was the issue.
If you have a switch that has sat either on the shelf or unused in a car for years, high resistance and poor contact at the wiper plates could be preventing the lights from working. Some contact cleaner and vigorous twisting of the knob may help but if corrosion is under the rivets it usually comes back.
Attach file:
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