Re: The Duchess Project: 1940 Super 8 Convertible Sedan
Posted by DavidPackard On 2020/3/10 13:28:18
Joe;
When my '48 had the same symptom of the headlights cycling ON-OFF it was to be sure the circuit breaker. While I was researching the characteristics of a thermal circuit breaker I ran into some information.
First: I found a comment that once a circuit breaker begins thermal cycling, and the load is not removed, then subsequent cycling will degrade the point set and the cycling will occur at a lower current. Also that same source included a warning that the circuit breaker would have about a 50 cycle life with the overload condition.
Second: DelCity has replacement circuit breaker for the '48 design, and within their product offerings is a page of technical specifications. I've included a PDF file that contains those specification. There are two curves that describe the influence of the environmental temperature, and the time delay as a function of overcurrent.
Given the first comment perhaps you should ensure the contact set is free of oxidation, and if there is any some effort should be made to restore the cleanliness of the contact set. Also if you do find oxidation do not adjust until to prove the headlight load will cause a 'trip'. When you test that switch/circuit breaker try to replicate the same orientation as it would be in the car.
dp
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When my '48 had the same symptom of the headlights cycling ON-OFF it was to be sure the circuit breaker. While I was researching the characteristics of a thermal circuit breaker I ran into some information.
First: I found a comment that once a circuit breaker begins thermal cycling, and the load is not removed, then subsequent cycling will degrade the point set and the cycling will occur at a lower current. Also that same source included a warning that the circuit breaker would have about a 50 cycle life with the overload condition.
Second: DelCity has replacement circuit breaker for the '48 design, and within their product offerings is a page of technical specifications. I've included a PDF file that contains those specification. There are two curves that describe the influence of the environmental temperature, and the time delay as a function of overcurrent.
Given the first comment perhaps you should ensure the contact set is free of oxidation, and if there is any some effort should be made to restore the cleanliness of the contact set. Also if you do find oxidation do not adjust until to prove the headlight load will cause a 'trip'. When you test that switch/circuit breaker try to replicate the same orientation as it would be in the car.
dp
Attach file:
Size: 33.68 KB; Hits: 107This Post was from: https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?post_id=219813