Tecumseh ECV100 - 120 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
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).
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.
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
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
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.
3600 R.P.M. - 12.0 Volts A.C.
If minimum values are noted, the alternator is okay. If the
minimum values are not noted, the alternator or A.C.
connector is defective. See Chapter 9 for "Disassembly
Procedure".
D.C. Charging Adaptor
Rectifier Bridge Check With Ohmmeter for D.C.
Adaptor
The following tests should be performed without the engine
running to determine the condition of the D.C. adaptor.
Continuity should exist during one of the two following tests.
No continuity should exist while performing the opposite
test.
If continuity exists during both tests, or if no continuity
exists during both tests, the D.C. adaptor is defective.
TEST NO. 1 - Connect negative probe of meter to red output
lead. Connect positive probe of meter to both A.C. terminals
and black output lead (diag. 14).
A.C. TERMINALS
(continued on top of next page)
#4414 BULB
YELLOW
YELLOW
#4414 BULB
OUTPUT LEADS
BLACK
RED
BLACK
RED
ENGINE
YELLOW
12
13
#4414
BULB
14
49