Cessna Split Master Switch -Red

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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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John R Verified Purchase


November 16, 2021

Looks nice.

Larry E Verified Purchase


November 12, 2021

If replacing a very old switch you may have to adapt, older have screws, this has terminals.

Gabino L Verified Purchase


June 4, 2021

Renato C Verified Purchase


May 24, 2021


Kevin A
December 14, 2020

perfect fit

November 9, 2020

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


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

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.

Q: My Cessna 182F SN 18254587 calls for split master switch Cessna PN S1159-1-1. Is Spruce PN 11-15900 the matching SN? thank you!

No, the 11-15900 is actually Cessna P/N# S1994-1-1. If you need P/N# S1159-1-1 this can be special ordered. Please our sales team a call and they can get in contact with our purchasing agents to get you pricing and availability on this.

Q: I need a new split master switch for my 1979 C185F. It has the 24v system. Will this switch work?

Yes, this can be used with both 14v and 28v systems.

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