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  #1  
Old 09-16-20, 06:20 PM
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mshac mshac is offline
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Lightbulb Cessna 400 Series Voltage Regulator Upgrade Kit

Problems with your alternators not properly sharing the electrical load? Alternator lights flashing on panel? Airplane going through alternators like underwear?

Potentially eliminate those problems, and more, with the Cessna 400 series voltage regulator upgrade kit. Upgrade to true "parallel" alternators!

Being in the aircraft parts business, I noticed I had several of the 400 series voltage regulators in inventory, so I thought I'd offer them to the 337 community.

This "kit" is nothing more than two used 400-series voltage regulators, step-by-step instructions and a wiring diagram I created, plus a copy of an actual 337 form that has been used successfully with several FSDOs. Since a field 337 is required, YMMV.

Installation time is estimated at 1 hour. All existing wiring is re-used, with the addition of only one new wire that connects the regulators. This is the "paralleling" line.

You will not receive any 8130 paperwork (these are used parts), although there may be a "yellow tag" on the regulators. I will guarantee the Voltage Regulators for 90 days after delivery. My liability is limited to the price you paid for the kit.

Price is $499.95, with free 2-3 day Priority shipping anywhere in the lower 48. Fully returnable within 30 days, buyer pays return shipping. Order processing may take a few days.

Any questions, feel free to PM me.

Last edited by mshac : 07-10-21 at 06:02 PM.
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  #2  
Old 12-23-20, 09:19 PM
Skymasterdriver Skymasterdriver is offline
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Can we buy you wire diagram and 337 paper work and us zeftronics regulators or is the Cessna ones all we can use ?
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  #3  
Old 12-27-20, 01:30 PM
california Sky california Sky is offline
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Looking to purchase diagrams please

Good morning

Looking to purchase the diagrams have a set of regulators available.

Please advise
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  #4  
Old 12-27-20, 01:58 PM
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mshac mshac is offline
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Copies Of Paperwork & Install Guide - $100

If you just need copies of all the FAA paperwork and the step-by-step instructions I wrote, plus tech support (if needed) its just $100. I will email everything immediately upon payment. Please PM me for payment details.
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  #5  
Old 05-01-21, 07:32 AM
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Another successful install mshac! My shop loved the package!
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  #6  
Old 05-01-21, 11:03 AM
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Quote:
Originally Posted by patrolpilot View Post
Another successful install mshac! My shop loved the package!
I'm very happy to know you're enjoying the upgrade to true parallel alternators!

Makes you wonder why Cessna didn't do it this way themselves, since they already had the parts and the design ready to go.

Last edited by mshac : 07-10-21 at 06:03 PM.
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  #7  
Old 05-09-21, 05:05 PM
JAG JAG is offline
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will this work for the older models?

Hi Mark,

Will your modification work for the 337A model as well? Mine has the two 30 amp alternators, and I have just replaced one of my voltage regulators and about to change the other...

These older planes have just 1 regulator for both alternators (the second one is just a spare), so one alternator is always carrying more load.

Thanks,
Jeff
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  #8  
Old 05-10-21, 02:07 PM
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JAG, the alternators would work fine with this system. It would require 337 field approval, just like all the other installs, but I've yet to hear of anyone being denied the 337, as its a simple and safe upgrade.
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  #9  
Old 07-10-21, 10:34 AM
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mshac mshac is offline
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Quote:
Originally Posted by Skymasterdriver View Post
Can we buy you wire diagram and 337 paper work and us zeftronics regulators or is the Cessna ones all we can use ?
This upgrade only covers factory Cessna voltage regulators. Its possible that a system could be designed using the Zeftronics VRs, but it may well be "a bridge too far" for an easy field 337 approval because it strays too far from the original design.

This modification takes an existing, approved system from 400 series aircraft and applies it to the Skymaster, with no changes to the POH or placards. The FAA seems to view this approach favorably.

Last edited by mshac : 07-10-21 at 10:46 AM.
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