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Part# 11-15900
MFR Model# S1994-1-1


This versatile split red master switch has been used in virtually all single engine Cessna models since 1970 and can be used in most light aircraft with single alternator systems. Left rocker normally used for alternator and right half for battery. Order mount separately.

Amp Rating is 20.
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works and fits as promised.

Joe M
May 28, 2020

This switch fits in my 1977 Grumman Tiger panel just fine and works great (so far)

William R
May 3, 2020

I like the switch, it fit perfect into my customers aircraft, where the other one was removed from during troubleshooting of an electrical issue. I think the switch is pretty well made and is working as it should.

Robert M
April 4, 2019

Works as advertised

Bill A
March 7, 2019

I like this switch. I did not find dimensions for this switch. I am enlarging the instrument panel opening because I need a split switch for so as to save space. The switch will suit my purposes.

Jody S
September 14, 2018

Rocket A
December 14, 2017

Jody S
September 14, 2018

Donât last long, i replaced a couple of years ago and now its on the blink again! So its a consumable as pr AD

Jesper R
April 12, 2020

These are original equipment however, since the beginning have had a rather short useful life. I always carry a spare in the airplane Iâm flying that is equipped with one. They are easy to replace should they fail.

Steve W
February 15, 2020

These switches are made in Mexico. They do not last. I have replaced two of them in my Lancair. They are riveted together, so you cannot take them apart to clean the contacts. Never again. I should have utilized two toggle switches instead when building the instrument panel.

Gary E
May 25, 2017


Q: How many amps can this switch handle?

The amp rating for this switch is 20.

Q: Is this Cessna Split Master Switch - Red FAA approved for installation in certified aircraft?

Yes, this is a Cessna part and is FAA approved to be used on Cessna aircraft. A field approval my be required if installed on any other certified aircraft.

Q: What are the dimensions of this Cessna split master switch? Specifically: the height, width, and depth?

The approximate dimensions are: 1-5/16" H x 3/4" W x 1-7/8" Max Depth (End of Terminal to top of Raised Switch).

Q: Can this switch be wired in either direction? I.e. Is one pole for ground only?

Per the supplier: Yes, they can be wired in either direction.

Q: Already purchased this switch. There was no wiring instructions with it. Do you know where to find it?

The Cessna split master, part number 11-15900, does not include any specific wiring instructions. The Cessna maintenance manual supplies all information needed for this installation. The positive and negative terminals on the switch are reversible, you may wire them in either direction.

Q: Tanis Heater. Can you leave these on continuously during cold weather without harming anything?

The great thing with a Tanis Preheat System is that you can leave it plugged in all the time and not have any concern of hurting anything. The reason for this is with a Tanis Preheat System we heat all of the components that are above the oil line hotter than the oil or another way to state it is the components are above the dew point temperature in your engine. We have the only preheat system that can make this claim. This keeps any moisture that is in your oil from condensing on those components.

Q: Which wire end terimianls are used with this switch? Pidg? size? Thanks.

Pidg terminals would work, the tabs are .25" wide.