Electrical System
36 24 690 34 Rev. DKohlerEngines.com
To test 20/25 amp rectifi er-regulators:
1. 20 amp: Connect single lead adapter in between B+ (center) terminal of rectifi er-regulator being tested and
squared single end of tandem adapter lead.
25 amp: Connect squared single end of tandem lead adapter to B+ (center/red) lead of rectifi er-regulator being
tested.
2. Connect tester ground lead (with spring clamp) to body of rectifi er-regulator.
3. Connect red lead and 1 of black leads to pair of terminals on open end of tandem adapter lead (connections are
not location specifi c).
4. Connect remaining black lead from tester to 1 of outer AC terminals on rectifi er-regulator.
5. Plug tester into proper AC outlet/power for tester being used. Turn on power switch. POWER light should be
illuminated and 1 of 4 status lights may be on as well. This does not represent condition of part.
6. Press TEST button until a click is heard and then release. Momentarily 1 of 4 status lights will illuminate indicating
partial condition of part.
Condition Conclusion
4 amp 15 Amp 20 amp 25 amp
OK (green) or HIGH light comes on
and stays steady.
Part is good and may be used. Disconnect tester black lead attached
to 1 AC terminal and reconnect it to
other AC terminal. Repeat test. If OK
(green) light comes on again, part is
good and may be used.
NOTE: A fl ashing LOW light can
also occur as a result of an
inadequate ground lead
connection. Make certain
connection location is clean
and clamp is secure.
Other lights come on.
Rectifi er-regulator is faulty and should not be used.
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