INSTALLATION INSTRUCTIONS
M S D I G N I T I O N
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Relays have a variety of specifications. A few things to consider include:
• Make sure the Relay can accept and handle the voltage and current required to activate the desired
circuit.
• The number of bobbins to use with different circuits (generally 1-2).
• The number of electrical contacts for the armature (generally 1-2).
• If the Relay is Normally Open (NO) or Normally Closed (NC).
Relay applications
Here are some examples of how a Relay can be used in typical automotive applications.
Figure 2 Inside the MSD Relays.
INSIDE
86
1
7
3
4
2
1
7
8
6
3
4
2
0
8
6
0
87
87A
87A
85
30
87 NO
NC
C
NO
NC
C
86
85
30
LOCATION OF PINS
MSD PN 8961 RELAY
MSD PN 8960 RELAY
NO - NORMALLY OPEN
NC - NORMALLY CLOSED
C - COMMON
AUTOTRONIC CONTROLS CORPORATION
1490 HENERY BRENNAN DR., EL PASO TX 79936
87
86
30
85
87a
TO
GROUND
YELLOW
RED
RELAY
PN 8961
RED
12 VOLTS
NITROUS OR
AIR SHIFT
SOLENOID
BLACK
TO
GROUND
GRAY
(NOT USED)
WHITE TO
MSD TACH
TERMINAL
OR COIL (-)
USING MSD RPM ACTIVATED SWITCH, PN 8950, AND
MSD RELAY, PN 8961, TO ACTIVATE A SOLENOID
PN 8950
RPM
ACTIVATED
SWITCH
AUTOTRONIC CONTROLS CORPORATION
1490 HENRY BRENNAN DR., EL PASO, TX. 79936
R
YELLOW COMPLETES THE
GROUND PATH OF THE CIRCUIT
Figure 3 Connecting a Transmission Solenoid with an MSD RPM Activated Switch and PN 8961 Relay.
