www.lesterelectrical.com 19
35827_A
11.
AC INPUT CIRCUIT TESTING
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, CONNECT ONLY TO A
PROPERLY GROUNDED OUTLET!
Check to be sure that the AC input cord is securely connected to a live AC outlet. When three-
prong to two-prong adapters are used, they tend to work loose, resulting in a poor connection.
Check the AC line fuse or circuit breaker and, if possible, measure the AC line voltage at the
outlet to be sure AC power is present. If necessary, connect a functioning charger, utility light,
or other electrical appliance to the outlet to verify the presence of AC power.
CAUTION: DISCONNECT BOTH AC INPUT AND DC OUTPUT CORDS FROM ALL
POWER SOURCES. POWER IS NOT NEEDED FOR THIS TEST.
If AC power is present at the outlet, disconnect the AC input cord from its outlet and the DC
output plug from the battery receptacle. Bypass the electronic charge controller as described
in Component Test Procedures SECTION 7A, Figure 7E, and with a continuity tester or multi-
meter set to measure resistance, check the circuit across the AC input cord prongs. With the
electronic charge controller bypassed, the resistance should measure less than two ohms
indicating the circuit is complete. If the circuit is complete, refer to the Wiring Diagram and
check the relay wiring and all connections. If the circuit is not complete, check the wiring of the
AC input cord, transformer primary coil wires, and the electronic charge controller. If the
charger is wired correctly, individually check the continuity of the AC input cord, transformer
primary and relay to see if any of these have failed open.
If the AC wall breaker blows, there may be a short in the AC circuit. Disconnect the AC input
cord from its outlet and the DC output plug from the battery receptacle. With a suitable
continuity tester or multi-meter, check the circuit across the AC input cord prongs and from
each prong to the enclosure ground terminal. The reading should display an open circuit,
indicating the circuit is not complete. If the circuit is complete, check to be sure the electronic
charge controller is NOT bypassed. If it is bypassed, remove the jumper and recheck the AC
input cord prongs for continuity. If still shorted, check the relay contacts as described in
SECTION 7B, to be sure they are open and have not welded closed. If the relay contacts are
closed, either the relay board assembly or the whole electronic charge controller will need to
be replaced. Further testing of the electronic charge controller should be done as indicated in
SECTION 7. If the relay contacts are open, either the AC input cord or the transformer may be
shorted. Disconnect the transformer wire from the relay NO terminal. If the short circuit goes
away, the transformer is shorted and must be replaced.
CAUTION: BE SURE ALL CONNECTIONS ARE CLEAN AND TIGHT. ALSO CHECK
TO BE SURE ALL WIRES AND TERMINALS ARE POSITIONED SO THEY DO NOT SHORT
TOGETHER OR TO THE CHARGER CASE.
