MSD 7564 - LED Indicators and Applications; LED Indicators; Typical Applications

INSTALLATION INSTRUCTIONS 3
Indicator
Left
Right
Status
On On Normal ‘On’
OffOff Normal ‘Off’
OffOn
Fault - Output Off
2
On Off
Fault - Output On
1
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.
1
Fault due to 12V applied directly to the output, or faulty unit.
2
Fault 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