211126
3
Vedpak 188_Version 1_070513
voltmeter is now connected to the regulator
“DFM” terminal. This voltage reading is a
function of field voltage and will change with
the amperage output of the alternator as the
load on the alternator changes. The voltmeter
reading will be the highest at low amperage
output and decrease as the output amperage
(load) increases.
11. Select the center “DEFAULT” setting on
the “SYSTEM SELECTOR SWITCH.” The
alternator should continue to operate but at a
lower voltage of 13.6 to 14.0.
12. This completes the testing process. This
process verifies that the regulator can receive
and process a signal and therefore is fully
functional.
Test procedure
(Alternator type date not known)
1. Testing an alternator where the operating
system (BSS or LIN) is not known is best
answered by this question. What happens if
you select the wrong system type? BSS or
LIN? Nothing. The LIN regulator sees the BSS
signal as random noise and does not respond.
In the same way, a BSS regulator sees the LIN
signal as noise. No harm will be done to either
the HC-CARGO 211126 or the alternator.
2. Select the “078” adapter plug.
3. Operate the alternator following the previous
instructions. Choose either BSS or LIN on
the “SYSTEM SELECTOR SWITCH.” Select
the 15.3 voltage setting on the “VOLTAGE
SELECTOR SWITCH.”
4. Start the test bench. Observe the output
voltmeter and ammeter. If the alternator
begins operating at a lower voltage of 13.6
to 14.0, it is operating in the default mode of
the other system. If this is the case select the
other operating system (BSS or LIN). Repeat
the test, if the alternator begins operating and
regulates at approximately at 15.3 it is the
operating system you then selected
5. Connect the (+) lead of the separate voltmeter
to the YELLOW (EXT. VOLT) jack on the
HC-CARGO 211126. Connect the (-) lead of the
voltmeter to the alternator (-) casting. Observe
the voltmeter. If you have a reading that
changes with amperage output load you have a
“COM-DFM” plug code “078” version.
6. Select the center “DEFAULT” setting on
the “SYSTEM SELECTOR SWITCH.” The
alternator should continue to operate but at a
lower voltage of 13.6 to 14.0.
7. This completes the testing process. This
process verifies that the regulator can receive
and process a signal. Therefore it is fully
functional.
General notes
The life of a test lead depends on the frequency
and severity of its use.
• Use care when inserting the respective connec
-
tor plugs, either on the tester or the alternator
to be tested.
• Always remove the plugs by pulling on the
housings not the wires.
• Inspect the condition of the various terminals
periodically and have the lead repaired if
needed.
If a test lead is suspected of not working correctly
try the lead using a known good OEM alternator.
The test lead requires BOTH a connection to
system POSITIVE (+) (RED wire) and to system
NEGATIVE (-) (BLACK wire.) Verify that you have
both.
Interior replacement parts are not available for
field repair of the test lead. If repair is needed,
return the lead to HC-CARGO for repair or
replacement.
GB
