Tecumseh ECV105 Technician's Handbook page 53

18 Watt A.C. Lighting Alternator
Models: H35, HS & HSSK 40-50, HM &
HMSK 70-80-100
CHECKING THE SYSTEM: To check the system,
disconnect the plug from the rest of the lighting system.
Connect a wire lead from the single pin connector coming
out of the engine to one terminal of a No. 4414, 18 watt
ENGINE
bulb. Connect another wire lead to the other terminal of
the bulb and run to a good ground on the engine. Start
the engine and test the circuit using the A.C. voltmeter
as shown (diag. 12).
YELLOW
With the engine running, minimum A.C. voltage across
the bulb should be:
2000 R.P.M. - 6.0 Volts A.C.
3000 R.P.M. - 8.5 Volts A.C.
#4414 BULB
12
3600 R.P.M. - 10.0 Volts A.C.
If minimum values are noted, the alternator is okay. If
less than the minimum values, the alternator is defective.
See Chapter 9 for "Disassembly Procedure".
1 Amp (18 Watt) Add-on Alternator
YELLOW
CHECKING THE SYSTEM: To check the system,
disconnect the plug from the rest of the lighting system.
Connect a No. 4414, 18 watt bulb in line with each terminal
in the plug. Start the engine and test the circuit using a
YELLOW
voltmeter as shown (diag. 13).
With the engine running, minimum A.C. voltage values
across the bulb should be:
2000 R.P.M. - 8.0 Volts A.C.
3000 R.P.M. - 10.5 Volts A.C.
#4414 BULB
3600 R.P.M. - 12.0 Volts A.C.
If minimum values are noted, the alternator is okay. If the
13
minimum values are not noted, the alternator or A.C.
connector is defective. See Chapter 9 for "Disassembly
Procedure".
D.C. Charging Adaptor OUTPUT LEADS
BLACK
Rectifier Bridge Check With Ohmmeter for D.C.
Adaptor
RED
The following tests should be performed without the
BLACK
engine running to determine the condition of the D.C.
RED
adaptor.
Continuity should exist during one of the two following
tests. No continuity should exist while performing the
opposite test.
A.C. TERMINALS
If continuity exists during both tests, or if no continuity
exists during both tests, the D.C. adaptor is defective.
#4414
TEST NO. 1 - Connect negative probe of meter to red
BULB
output lead. Connect positive probe of meter to both A.C.
terminals and black output lead (diag. 14). 14
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