Check your Overvoltage Relay!

[Jhogan0101]

Those units are great. I just replaced my old one with 2 new. They both put out a steady 28.5 volts 👍

[mshac]

Protip - If you don't have a voltage display, buy a USB to cigar lighter adapter that includes a digital voltage display. They are cheap, maybe $10 on Amazon. The voltage at the bus is slightly lower than the voltage the alternator is producing, but its close enough!

[Learjetter]

+1 for the solid-state regulators. But, they still require the rest of the system (overvolt, paralleling circuit board, overvolt test, alt restart system, diodes, etc), on my G model.

So I got all of old Tom Carr’s electrical system 337s and wrote a 337 eliminating these components and using Plane Power R1224 regulators. A fed buddy ran it thru Wichita ACO and local FSDO for field approval. The feds were enthusiastically supportive and helpful.

Of course, during this, the charging system has been behaving very well, but at the next hiccup, we are doing the mod.

[mshac]

For anyone interested, I sell a $400 kit that includes two Cessna 400-series aircraft voltage regulators, a wiring diagram, instructions, and an approved 337 form that has been successfully copied word-for-word.

True parallel alternators and voltage regulators is the way to go. It assures the load is being shared, not flipped completely from one alternator to the other.

Not sure what Cessna was thinking when they installed the Rube Goldberg approved factory system

The kits installs in under an hour, and the only NEW wire added to your aircraft is a paralleling wire that connect the two new voltage regulators.

Everything on your panel works the same, and there is no change to the POH.

The only difference is you won't see the alternator lights go on and off during your flight!

[Skymasterdriver]

Can we use your wire diagram with the zeftronic regulators or do we need the 400 Cessnas ?

[patrolpilot]

I'm interested, PM sent.

Originally Posted by mshac

For anyone interested, I sell a $400 kit that includes two Cessna 400-series aircraft voltage regulators, a wiring diagram, instructions, and an approved 337 form that has been successfully copied word-for-word.

True parallel alternators and voltage regulators is the way to go. It assures the load is being shared, not flipped completely from one alternator to the other.

Not sure what Cessna was thinking when they installed the Rube Goldberg approved factory system

The kits installs in under an hour, and the only NEW wire added to your aircraft is a paralleling wire that connect the two new voltage regulators.

Everything on your panel works the same, and there is no change to the POH.

The only difference is you won't see the alternator lights go on and off during your flight!