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IQ PLUS CHARGER (EXTERNAL)
Troubleshooting
Page 8-10
2008-2011 Domestic Battery Charger Maintenance and Service Manual
8
IQ PLUS BATTERY CHARGER TROUBLESHOOTING GUIDE
SYMPTOM
POSSIBLE CAUSES
CORRECTIVE ACTION
Relay does not close, no transformer
hum and ammeter does not move
Batteries disconnected
Connect the batteries.
See Connecting
The Batteries on page 1-4.
Battery voltage is too low
Test Procedure 1 – Battery Voltage and
DC Plug and Receptacle on page 8-13
Poor connection between plug and
receptacle
Test Procedure 1 – Battery Voltage and
DC Plug and Receptacle on page 8-13
DC plug and cord
Test Procedure 1 – Battery Voltage and
DC Plug and Receptacle on page 8-13
and Test Procedure 5 – Charger DC
Circuit Continuity Test on page 8-17
Onboard computer malfunction
Test Procedure 2 – Onboard Computer on
page 8-15
Gray sense lead fuse is blown
Test Procedure 1 – Battery Voltage and
DC Plug and Receptacle on page 8-13
Receptacle fuse link is blown
See Electrical Components section in the
appropriate maintenance and service
manual
Poor connection of 10-gauge black wire or
18-gauge gray wire at the onboard
computer
Check wire connections
Relay closes with an audible click but
no transformer hum and ammeter does
not move
Improper AC outlet voltage
Test Procedure 3 – AC Power and
Continuity Test of AC Circuit on page 8-15
Failed AC plug and cord
Test Procedure 3 – AC Power and
Continuity Test of AC Circuit on page 8-15
Internal AC breaker
Test Procedure 3 – AC Power and
Continuity Test of AC Circuit on page 8-15
Transformer primary coil
Test Procedure 6 – Transformer on
page 8-18
Relay
Test Procedure 8 – Continuity on
page 8-20
Failed ammeter
Replace ammeter
Relay closes and transformer hums but
ammeter does not move
Blown charger fuse
Test Procedure 4 – Diodes on page 8-16
Both Diodes failed
Test Procedure 4B – Both Diodes Failed
on page 8-17
Onboard computer malfunction
Test Procedure 2 – Onboard Computer on
page 8-15
Failed transformer
Test Procedure 6 – Transformer on
page 8-18
Relay operates intermittently
Failed charger relay
Test Procedure 8 – Continuity on
page 8-20
Single charger fuse link blows
Diode failed
Test Procedure 4A – Single Diode Failure
on page 8-16
Loose internal fuse connection
Tighten connection
Both charger fuse links blow or
receptacle fuse link blows
Battery is wired in reverse polarity
Check vehicle wiring
DC cord is wired in reverse polarity
Check battery charger wiring
Both diodes failed
Test Procedure 4B – Both Diodes Failed
on page 8-17
Troubleshooting Guide continued on next page...
Summary of Contents for 2008-2011
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