MSD 7564 User manual

FEATURES
• 5 to 20 volt supply
• Four Independent 20A branches
• Automatic Over-temp Protection
• Short circuit protection
• Versatile mounting options
• Single-wire activation by switching
power or ground
• LED Status indicators
• Combined total continuous current
rating of 80 amps
OPERATION
The main power supply to the unit should originate at the positive battery post. There are four
independent branches. Each branch is thermally protected against overload and electrical short.
Once the protection circuit has tripped, the activation signal needs to be removed and re-applied to
reset the affected channel(s).
MOUNTING
The Solid State Relay Module must be mounted in a sturdy, dry location and away from extreme heat.
The unit should not be immersed or subjected to direct spray from a power washer.
WARNING: LIVE BATTERY POWER:
Failure to follow these warnings may cause re, injury, property damage, or even
death.
All connections must be properly secured.
Use only automotive grade wire with adequate heat and uid resistance.
All wire gauges must be adequate for the current in the application.
WIRE SIZE SELECTION GUIDE
Current Rating AMP Minimum Wire Size AWG
80 4
60 6
20 12
Parts Included:
1 - MSD Solid State Relay Module
1 - Mounting Kit
WARNING: During installation, disconnect the battery cables.When disconnecting, always remove
the Negative cable first and install it last.
Solid State Relay Block
PN 7564 Red / PN 75643 Black
Figure 1 PN 7564 Stand Alone Solid State Relay

2 INSTALLATION INSTRUCTIONS
WIRING
The main power feed and distribution
wires, connected to the large terminals,
must be sized according to the Wire
Size Selection Guide on Page 1. All
other wires (ground and activation /
deactivation) can be 18-22 AWG.
1. Connect the small right terminal,
marked “G”, in the lower level to a
good engine ground (Figure 2)
.
WARNINGS: Attach the power wire
to the BATT terminal
before connecting it to
the battery post.
Remove the power wire from the
battery post before removing it from
the BATT terminal
Figure 2 Solid State Relay.
Figure 3 12V Activation.
Figure 4 Ground Activation.
2. Securely connect the BATT terminal to the positive
battery post. Use the wire size selection guide to
choose the appropriate wire.
3. Each output branch can be activated by one of two
congurations, ground or 12 volts.
Note A: The lower right terminal marked “G” must be
grounded for either conguration (Figure 3 & 4).
Note B: 12V Activation - apply 12V to the appropriate
upper level terminal, 1-4 (Figure 3).
Note C: Ground Activation - apply ground to the
appropriate lower level terminal, 1-4 (Figure 4).
A Loctite® Threadlocker 242® packet is
included to fasten all threaded screws.
It will penetrate the thread grooves, and bond
within 10 minutes. The medium strength bond
can be broken with hand tools, if necessary.
Apply only a small amount of Loctite 242 onto
the thread of each of the 5 screws.
Do not apply too much Loctite.
OUTPUTS
(LABELED 1-4
STATUS LEDS
BATTERY INPUTS
LABELED 1-4)
LOWER LEVEL TERMINALS
FOR GROUND ACTIVATIONS GROUND
UPPER LEVEL TERMINALS
FOR 12V ACTIVATIONS
MOUNTING TAB
CAN BE ROTATED 90O
12V
SWITCHED
ACTIVATION
(1 THRU 4)
GROUND
12V
12V
SWITCHED
ACTIVATION
(1 THRU 4)
GROUND
GROUND
NOTE: THIS GROUND IS REQUIRED
REGARDLESS OF WHETHER
THE INDIVIDUAL CHANNELS
ARE ACITVATED WITH +12V
OR GROUND
NOTE: THIS GROUND IS REQUIRED
REGARDLESS OF WHETHER
THE INDIVIDUAL CHANNELS
ARE ACITVATED WITH +12V
OR GROUND

INSTALLATION INSTRUCTIONS 3
Indicator Left Right Status
On On Normal ‘On’
OffOff Normal ‘Off’
OffOnFault - Output Off 2
On Off Fault - Output On1
LED
LED INDICATORS
Each relay branch has two diagnostic LEDs just below the corresponding terminal. The LEDs status can
assist with diagnosing wiring problems, locating short circuits, or excessive current draws (Figure 5).
Diagnostic: Verify battery and ground connections. Deactivate/Reactivate the faulted channel(s) to
reset.
Figure 5 Diagnostic LED Chart.
1Fault due to 12V applied directly to the output, or faulty unit.
2Fault due to over-current, missing BATT Power or Ground. Reset
faulted channels(s) by deactivating/re-activating via applicable
trigger wires(s).
Figure 6 PN 7564 Typical Applications.
Note: Two, or more, channels can be combined for devices requiring more than a 20A single-channel
rating. See Figure 7 for paired channel operation.
MAX LOAD
20AMP PER
CHANNEL
FAN
GROUND
BATTERY/
CHASSIS
GROUND
MODULE
ACTIVATED
SWITCHED
GROUND
GROUND
NOTE: THIS GROUND IS REQUIRED
REGARDLESS OF WHETHER
THE INDIVIDUAL CHANNELS
ARE ACITVATED WITH +12V
OR GROUND

Service
In case of malfunction, this MSD component will be repaired free of charge according to the terms of the warranty.
When returning MSD components for warranty service, Proof of Purchase must be supplied for verification. After
the warranty period has expired, repair service is based on a minimum and maximum fee.
All returns must have a Return Material Authorization (RMA) number issued to them before
being returned.
When returning the unit for repair, leave all wires at the length in which you have them installed. Be sure to
include a detailed account of any problems experienced, and what components and accessories are installed on the
vehicle.
-
+
Figure 7 PN 7564 Paired Channel Application.
TWO CHANNELS
(3&4) PAIRED
BATTERY/
CHASSIS
GROUND
GROUND
FUEL PUMP
12V SWITCHED
ACTIVATION
CHANNELS 3 & 4
GROUND
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