Tundra10
Joined: 14 Jun 2010
Posts: 102
Location: Scarborough, Ontario
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 Posted: Mon Nov 17, 2014 10:02 am Post subject: Charging system problem - please help |
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Digging through the schematics and parts listing, the over voltage
sensor was added at serial number 17259904 which was the second
production year of the 172L (1972).
I have a 1970 K model which has circuit breakers and the new double
rocker master switch.
Unfortunately, it looks like to add the over voltage module, I also
need to change the regulator, which has the additional connection for
the low voltage light, so it becomes an expensive proposition. I also
don't know what Transport Canada would require to consider the change
legal. So I won't bother.
Jeff Page
Dream Aircraft Tundra #10
| Quote: | Time: 05:58:40 AM PST US
From: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com>
Subject: Re: Re: Charging system problem - please
help troubleshoot
At 07:13 2014-11-16, you wrote:
>
> I can tell you for sure that 1968 & 1969 Cessna 172's were equipped
> with alternators and a push-pull master switch AND no over-voltage
> protection. Don't forget that the alternator ground is part of the
> charging circuit.
Good data point. Thanks! I'm going to the
Textron Electronics Lab Thanksgiving lunch
next week. I'll get into the archives and
see what the evolutionary steps were that
lead up to the full changeover to alternators,
rocker switches and ov protection.
Did those aircraft still have fuses?
Bob . . .
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