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POWERDRIVE 3 – MODEL 26560
Test Procedures
Page 6-26
2008-2011 Domestic Battery Charger Maintenance and Service Manual
6
Voltage Suppressor – Failed Closed
The voltage suppressor, which is incorporated into the relay board assembly, protects the onboard computer
by capturing very high, but very brief voltage spikes which occur due to the collapse of the electrical field in the
charger relay when the charger is disconnected from the vehicle.
1. Disconnect AC cord from the wall outlet and DC plug from the vehicle receptacle.
2. Remove the charger cover.
3. Using a multimeter set to the diode test function (
ç
), place the black (–) probe of the multimeter on the
sense lead pin (short pin) of the DC plug. Place the red (+) probe on the positive (+) pin of the DC plug.
The multimeter should indicate 1.5 (±.3) volts. If a reading of <.5 volt, then the voltage suppressor has
shorted and the relay should be replaced. If the meter indicates an overload condition, then the voltage
suppressor has failed and the relay should be replaced.
See following NOTE.
NOTE: All vehicles except Precedent:
Repeated failure of sense lead fuses is a symptom of a voltage
supressor that has failed in a closed condition.
Precedent vehicles only:
Failure of the onboard computer (prior to Version 3.0) due to a blown
internal sense lead fuse is a symptom of a voltage supressor that has failed in a closed condition.
The Version 3.0 and 4.0 onboard computers will quickly flash the battery warning light on the dash
to indicate a problem with the voltage supressor.
Relay
1. Disconnect AC cord from the wall outlet and DC plug from the vehicle receptacle.
2. Remove the charger cover.
3. Remove black wires (3 and 4) from contact terminals of the relay
(Figure 6-9, Page 6-11)
. Place conti-
nuity test probes on contact terminals of the relay. The tester should indicate no continuity. If tester indi-
cates continuity, the relay contacts have failed closed and the relay must be replaced.
4. Place continuity test probes on contact terminals of relay. With batteries connected, insert DC plug into
receptacle. The tester should indicate continuity. If tester does not indicate continuity, relay must be
replaced.
Ammeter
1. Disconnect AC cord from the wall outlet and DC plug from the vehicle receptacle.
2. Remove the charger cover.
3. Disconnect the white wire from the left ammeter terminal (as viewed from inside the charger).
4. Place the continuity tester clip on one of the ammeter posts.
5. Place the continuity test probe on the other ammeter post. The tester should indicate continuity. If the
tester does not indicate continuity, replace the ammeter.
AC Circuit Breaker
1. Disconnect AC cord from the wall outlet and DC plug from the vehicle receptacle.
2. Remove the charger cover.
3. Disconnect the wires from the AC circuit breaker.
4. Place the continuity test probe on the two terminals of the AC circuit breaker. The tester should indicate
continuity. If the tester does not indicate continuity, replace the AC circuit breaker.
Summary of Contents for 2008-2011
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