Mercury 40 Service Manual page 85

VOLTAGE REGULATOR/RECTIFIER TEST
NOTE: Voltage regulator/rectifier specifications are
given for informational purposes only, use the
appropriate troubleshooting techniques previously
mentioned to find the faulty component in the charg-
ing system.
DIODE TEST:
1. Set Ohm meter to R X 10 scale.
2. Connect Red (+) meter lead to RED regulator
lead.
3. Connect Black (–) meter lead to YELLOW regula-
tor lead.
TEST RESULTS:
100 - 400 OHMS
DIODE TEST:
1. Set Ohm meter to R X 1k scale.
2. Connect Black (–) meter lead to RED regulator
lead.
3. Connect Red (+) meter lead to YELLOW regula-
tor lead. Test. Then change Red (+) meter lead to
the other YELLOW regulator lead for 2ND test
reading.
TEST RESULTS (1ST READING):
40,000 to 1 OHMS
TEST RESULTS (2ND READING):
1 OHMS (No needle movement)
2B-10 - ELECTRICAL
SCR TEST:
1. Set Ohm meter to R X 1k scale.
2. Connect Red (+) meter lead to regulator case.
3. Connect Black (–) meter lead to one YELLOW
regulator lead. Test. Connect Black (–) meter
lead to the other YELLOW lead.
TEST RESULTS (BOTH TESTS):
15,000 - 1 OHMS (15k - 1)
TACHOMETER CIRCUIT TEST:
1. Set Ohm meter to R X 1k scale.
2. Connect Red (+) meter lead to GREY regulator
lead.
3. Connect Black (–) meter lead to regulator case.
TEST RESULTS:
10,000 - 50,000 OHMS (10k - 50k)
90-852572R1 JANUARY 1998