Murphy Switch EGS21 Series User Manual

00-02-0251  
02-27-08  
Section 70  
EG21 and EGS21 Series Electric Gage and Swichgage® Installation  
for Pressure, Temperature, Fuel Level, Voltmeter and Ammeter  
IMPORTANT NOTICE FOR ALL EG21 ELECTRIC GAGES AND EGS21 ELECTRIC  
SWICHGAGES FOR 24VDC AND 32VDC APPLICATIONS  
A change in the dial illumination circuit has made it necessary to change the external wiring harness.  
If you use the incorrect wiring harness, irreparable damage will occur to the gage mechanism.  
The table below lists correct wire harness assemblies for units by manufacturing date. For date code  
R1 (January 1996) or earlier (Q12, Q11, etc.) the wire harness can be identified by P/N and by  
BLACK shrink tubing on the YELLOW wire. For date code R1 (February 1996) and later (R3, R4,  
etc.) the wire harness can be identified by P/N and by RED shrink tubing on the YELLOW wire.  
Date Code R1 or Earlier  
Date Code R2 or Later  
05004546  
05004547  
05004548  
05004549  
05004550  
05004551  
05004552  
05006166  
05006167  
05006168  
05006169  
05006170  
05006171  
05006172  
If dial illumination is NOT required, either wire harness can be used on any date code, if the YELLOW  
wire is NOT connected.  
Wire/Connector Assembly  
NOTE: EG21 Series gage and EGS21 Series Swichgage movement and illumination  
require 12VDC to function. For 24 or 32 volt systems, voltage converters are built into the  
electrical wire/connector assembly and supplied with instrument.  
Listed below are replacement part numbers for all wire/connector assemblies. Voltage converter included for 24  
and 32 volt. Specify part number when ordering.  
12 VDC  
24 VDC  
32 VDC  
EG21P / T / F  
EGS21P / T / F  
EG21AM  
EGS21AM  
EG21VM  
05004506  
05004507  
05004505  
05004504  
05004508  
05004504  
05006166 (05004546)*  
05006168 (05004548)*  
05006170 (05004550)*  
05006172 (05004552)*  
05004508  
05006167 (05004547)*  
05006169 (05004549)*  
05006171 (05004551)*  
EGS21VM  
05004504  
* For gages with date code R1 (January 1996) or earlier (Q12, Q11, etc.,) specify part number shown in parenthesis.  
Gage Installation  
In order to consistently bring you the highest quality, full featured products, we reserve the right to change our specifications and designs at any time.  
MURPHY, the Murphy logo, and Swichgage  
matter and illustrations, is copyright protected by Murphy Industries, Inc., with all rights reserved. (c) 2008 Murphy Industries, Inc.  
®
are registered and/or common law trademarks of Murphy Industries, Inc. This document, including textual  
 
Page 3 of 4.  
Basic Wiring  
WARNING: Disconnect battery negative cable before wiring or  
service.  
*Yellow wire is optional for gage illumination  
and does not need to be connected for gage  
to operate.  
Sender Wiring  
Swichgage Wiring  
WARNING: DISCONNECT BATTERY NEGATIVE CABLE BEFORE  
WIRING OR SERVICE.  
CAUTION: Connecting full Battery potential to the brown wire can  
damage the Swichgage. Shutdown circuit is rated for 300 mA  
continuous, 900 mA inrush. Circuit rounds out at set point.  
Warranty - A limited warranty on materials and workmanship is given with this FW Murphy product. A copy of the warranty  
 
Page 4 of 4.  
CAUTION: Devices containing solid state components can be  
damaged or caused to malfunction when used in systems which  
incorporate inductive loads (e.g. relays, solenoids, etc.) that can  
generate voltage spikes.  
To reduce the potential for this type of damage, install a flyback or  
clamping diode across all inductive loads (see wiring diagram  
below).  
Use Murphy diode package 65-00-0343 or equivalent. A typical  
diode is 1N4005 which is readily available from commercial  
sources. Failures of this type are not covered by our Limited  
Warranty.  
Warranty - A limited warranty on materials and workmanship is given with this FW Murphy product. A copy of the warranty  
 

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