Modification

12-48V
1
AMP
For “Key Switch”
operation, your board
must look like this one.
If there is no key
switch solder pad as
shown (Red Arrow),
your BCM cannot be
modified. Please
contact
[e-mail]
and we will arrange a
swap for you.
To modify an MNBCM for Key Switch
operation, simply remove the “zero ohm”
resistor #28 as indicated by the yellow arrow
and solder a small gauge wire (#16-22) to the
pad indicated by the Red Arrow and labeled
“KEY SWITCH”.
This wire is, as shown below, the switched
positive supply to the MNBCM and will
illuminate all of the appropriate LEDs when
power is applied.
IMPORTANT
NOTE
Your MNBCM will already have the
Red and Black battery leads
connected, there is no need to
remove these, just add the Key
Switch lead.
THE USE OF AN 1-2 AMP
FUSE OR BREAKER IN
THE BATTERY POSITIVE
LEAD IS HIGHLY
RECOMMENDED FOR
SAFETY
MIDNITE SOLAR BATTERY CONDITION MONITOR MODIFICATIONS
FOR SWITCHED OPERATION
This field modification can be performed on REV B MNBCMs and will allow for the LED
indicators for battery state of charge as well as the Battery Maintenance LEDS to be
switched off as desired.
The Battery Maintenance settings will be retained.
With the LEDS off, power draw is reduced to 6 ma @ 12 volts