30
31
B
S
1
3
2
7
MAGNETIC CIRCUIT VDROP™ TEST
The Magnetic switch circuit supplies a path for current to the coils of the starter
solenoid with minimum voltage drop. The Magnetic circuit is indicated by the
dotted line on the illustration below. The Magnetic circuit test is designed to
test the voltage drop of this circuit. It has three steps. If it passes the first test
the whole circuit passes and there is no need to continue. If the first test fails,
the next two tests are completed to obtain results of each leg and the magnetic
switch itself. The Magnetic switch is energized by the ignition switch in each test.
For safety, disconnect the negative cable from the battery.
This is a continuation of the Starting
System Test, but can also be selected
from the VDrop Menu by selecting
>MAG. CIRCUIT then press Enter.
In the individual test you will be
asked to disconnect the Magnetic
circuit from the “S” terminal on the
starter solenoid as explained on the
previous page. This is necessary to
avoid starting the engine during this
test sequence.
Magnetic Circuit 3-Step Setup
NOTE:
ON 12 VOLT SYSTEMS THE SMALL BLACK LEAD CAN BE LEFT
DISCONNECTED OR CAN BE CONNECTED TO ANY GROUND. ON 24 VOLT SYSTEMS
THIS LEAD MUST BE CONNECTED TO THE STARTER GROUND.
CHARGING CABLES
STR MAIN CABLES
>MAG. CIRCUIT
LIFTGATE VDROP
Connect the large red clamp (+)
to the disconnected ring from
the S-terminal magnetic circuit.
Connect the large black clamp
(-) to the starter ground (See
Illustration)
Connect the small red lead (+) to
the 'B' terminal (+) of the starter
solenoid. Attach the small black
lead (-) to the starter ground (See
Illustration - small clamp position 1)
Reconnect the negative terminal
on the battery. Then energize
the Magnetic Switch for 3-5
seconds. Note. This can be done
by a remote starter or by a second
person turning the ignition.
Wait for results.
If voltage drop is within
specifications the whole circuit
passes. This test should be done
THREE TIMES when rotating contact
magnetic switches are utilized.
>CONNECT SMALL
LEADS TO THE
STARTER SOL/GND
'Y' TO CONTINUE
>CONNECT LARGE
LEADS TO THE
S-TERMINAL/GND.
'Y' TO CONTINUE
>ENERGIZE THE
MAG SWITCH FOR
3-5 SECONDS.
'N' TO CANCEL
LOADING
PLEASE WAIT...
#337 MAG/CIRCUIT
PASSED!
DROP WITHIN SPEC
DROP @80A. 0.65V
MAGNETIC CIRCUIT TEST (Cont.)
Use the + / - key to select the type
of starter you are testing.
SELECT STARTER TYPE.
STRAIGHT DRIVE/GEAR
REDUCTION
'Y' TO CONTINUE
DISCONNECT THE
S-TERMINAL FROM
STARTER SOL.
'Y' TO CONTINUE
This is the small wire on the starter
solenoid that activates the starter
