Re: 1937 120C Current Draw
Posted by HH56 On 2023/12/23 19:49:59
Is your charging system still mostly stock with the 3rd brush generator but using a different or replacement regulator? If not stock, what were changes to the charging components?
I cannot read the number of the regulator you show but all illustrations showing the called for unit that are in the 37 service manual and in the combination 37-38 manual show the regulator as having 4 terminals. It appears capacity is the main if not the only difference between 37 and 38 models so one question would be is that regulator you show compatible with the generator? At any rate, all regulators have springs that are supposed to open the cutout relay contacts when the engine is off thus preventing any feedback current from the battery going thru the regulator and generator. Like the regulator/generator wiring diagram shows, in most cars the generator case is grounded to the fender or frame and to avoid poor sheet metal connections, also directly to the regulator.
One interesting thing is there is a caution note in the combination service manual that the cutout relay can be damaged if polarity has been reversed but it does not specify what happens. Is there any chance a reversal has happened either accidentally or on purpose and that regulator has a problem?
Attach file:
page.jpg (651.87 KB)
I cannot read the number of the regulator you show but all illustrations showing the called for unit that are in the 37 service manual and in the combination 37-38 manual show the regulator as having 4 terminals. It appears capacity is the main if not the only difference between 37 and 38 models so one question would be is that regulator you show compatible with the generator? At any rate, all regulators have springs that are supposed to open the cutout relay contacts when the engine is off thus preventing any feedback current from the battery going thru the regulator and generator. Like the regulator/generator wiring diagram shows, in most cars the generator case is grounded to the fender or frame and to avoid poor sheet metal connections, also directly to the regulator.
One interesting thing is there is a caution note in the combination service manual that the cutout relay can be damaged if polarity has been reversed but it does not specify what happens. Is there any chance a reversal has happened either accidentally or on purpose and that regulator has a problem?
Attach file:
page.jpg (651.87 KB)
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