1965 alternator switch

[JB78382]

No, the rear alternator is doing just fine. The "Standby/Run" switch worked as advertised. The front alternator fell apart (literally) during approach to destination. I had not paid the alternator switch any real attention until then. I have now had my attention refocused.

During pre-flight run up I have a set of toggles and meters that measure either battery or alternator levels of charge/discharge, as long as the needles said charging and the load was equal, I was a happy guy. We didn't get into the mechanics of the actual alternator switches until it came time to shut stuff down.

At my maintenance base (KRBD) there are 4 vintage 1974/6 337s. I looked at each of those and my set up is very different from them. The other 337 are all either P337 or T337s with 38 amp or more alternators.


Jerry

[DrDave]

Jerry:

What is the serial number of your plane? I will look at the wiring diagram.

Dave

[Kim Geyer]

I know just what you are talking about. Just got 4 new switches today and you can turn them both on, but can only turn the fwd one off but not just the rear without turning the fwd off too. I can see an easy fix by removing a small tab between the 2 switches
I plan to call Cessna and tell them about their blunder.

[JAG]

It would seem Cessna had a reason for this - but I can't think of it. You have me wondering about my '66 now. Will check it on the weekend.

Jeff

[JAG]

Sorry for the delayed follow up. My '66 (337-0487) alternator switch can switch both on or off independently.

Jeff

[cessnadriver]

Hello. I have the same type switch for my MASTER on my 69 C172. The left side (Alternator) right (Battery) you can switch on the battery independently but with both on you try to turn off just alternator side both go off. I was wondering where the "TAB" is you are talking about removing? I'd like to do this modification as well??
BILLS

[DABULLY82]

I think you could have a fuel pump switch instead alternator switch, cause the way you describe it works is as a fuel pump switch