Installation Guide

AC1118 Battery Installation Instructions for Legacy Gauges
Mark-10 Corporation n www.mark-10.com n [e-mail]
Toll-free: 888-MARK-TEN n Tel: [phone] n Fax: [phone]
The 8.4V NiMH AC1118 battery is designed for use with new Mark-10 gauges. They can also be used with legacy gauges, however, some modications are required.
Failure to perform this modication will not cause damage to the gauge, however, the period of time per battery charge will be signicantly reduced. Applicable legacy
gauge series include Series BG, BGI, EG, and CG. Refer to the instructions below:
11
22
33
44
55
Separate the two halves of
the gauge housing by loos-
ening the captive screws.
Then pull the two halves
apart.
The separated halves ap-
pear as above. The PCB
of interest is the auxiliary
PCB, shown on the right
half, adjacent to the battery.
Remove the battery before
beginning work on the modi-
cations.
Identify the R4 resistor
(brown color), with the
thermistor (silver color) sol-
dered to it. The connection
between the two compo-
nents is highlighted with a
yellow arrow.
Using a pair of wire cutters,
cut the connection between
the components.
Twist the thermistor away
from the resistor, or cut it
out completely. Note the
absence of the connection,
identied by the yellow ar-
row. Then, install the new
battery and reassemble the
two halves of the housing.