Lit. No. 41936, Rev. 00 4 August 15, 2015
41000
ISOLATION
MODULE
3-PORT
NOTE: CONTAINS NO
SERVICEABLE PARTS
U.S. Patents 5,420,480 and 7, 400,058
DOUGLAS DYNAMICS, L.L.C.
OVERVIEW
The Isolation Module Tester performs continuity tests
on the 29070-1 and 29760-1 three-port isolation
modules for snowplow lighting systems.
CAUTION
Batteries normally produce explosive gases,
which can cause personal injury. Therefore,
do not allow ames, sparks or lit tobacco
to come near the battery. When charging or
working near a battery, always cover your
face and protect your eyes, and also provide
ventilation.
• Batteries contain sulfuric acid, which burns
skin, eyes and clothing.
• Disconnect the battery before removing or
replacing any electrical components.
FUSES
The snowplow electrical and hydraulic systems
contain several blade-style automotive fuses. If
a problem should occur and fuse replacement is
necessary, the replacement fuse must be of the same
type and amperage rating as the original. Installing a
fuse with a higher rating can damage the system and
could start a re. Fuse Replacement, including fuse
ratings and locations, is located in the Maintenance
section of the Owner's Manual.
PERSONAL SAFETY
• Remove ignition key and put the vehicle in park or
in gear to prevent others from starting the vehicle
during installation or service.
• Wear only snug-tting clothing while working on
your vehicle or snowplow.
• Do not wear jewelry or a necktie, and secure long
hair.
• Wear safety goggles to protect your eyes from
battery acid, gasoline, dirt and dust.
• Avoid touching hot surfaces such as the engine,
radiator, hoses and exhaust pipes.
• Always have a re extinguisher rated BC handy,
for ammable liquids and electrical res.
BATTERY SAFETY
29070-1
Green Label
29760-1
Blue Label
(soft-start)
The tester simulates vehicle and snowplow low/high
beam, left/right turn signal, parking light, and control
power functions but does not simulate any load
conditions.
When the tester detects a continuity failure, the screen
display will identify the module component that is not
functioning. Record that information on your warranty
claim form and RMA tag.
The Isolation Module Tester is protected by internal
fuses. In the event of a short circuit or too much
current being drawn by the isolation module, the tester
will reset itself. There are no user-serviceable parts in
the Isolation Module Tester.
