ElectricalSystemQuickChecks
TestingtheBattery(OpenCircuitTest)
Useamultimetertomeasurethevoltagebetweenthebatteryterminals;referto
BatteryT estTable(page6–15).
SetthemultimetertotheDCvoltssettings.Thebatterymustbeatatemperature
of16°Cto38°C(60°Fto100°F).EnsurethatthekeyisintheOFFpositionand
alltheaccessoriesareturnedoff.
Connectthepositive(+)multimeterleadtothepositivebatterypostandnegative
(-)multimeterleadtothenegativebatterypost.
Measureandrecordthebatteryvoltage.UsetheBatteryT estT able(page6–15)
todeterminechargelevelofthebattery.
Note:Thistestprovidesarelativeconditionofthebattery.Theloadtestingof
thebatteryprovidesadditionalandmoreaccurateinformation;refertoServicing
theBattery(page6–81).
BatteryTestTable
VoltageMeasured
BatteryChargeLevel
12.68V(orhigher)Fullycharged(100%)
12.45V
75%charged
12.24V
50%charged
12.06V
25%charged
11.89V
0%charged
TestingtheChargingSystem
Thisisasimpletestthatdeterminesifachargingsystemisfunctioning.Ittells
youifthechargingsystemhasanoutput,butnotitscapacity.
Toolrequired:DigitalmultimetertosetDCvolts.
Testinstructions:Connectthepositive(+)multimeterleadtothepositivebattery
postandnegative(-)multimeterleadtothenegativebatterypost.Keepthetest
leadsconnectedtothebatterypostsandrecordthebatteryvoltage.
Note:Whenstartingtheengine,thebatteryvoltagedropsandthenmust
increaseoncetheengineisrunning.
Note:Dependingupontheconditionofthebatterychargeandbattery
temperature,thebatteryvoltageincreasesatdifferentratesasthebattery
charges.
Starttheengineandrunitathigh-idlespeed.Allowthebatterytochargefora
minimumtimeof3minutes.Recordthebatteryvoltage.
Note:Afterrunningtheengineforaminimumtimeof3minutes,thebattery
voltagemustbeminimum0.50Vhigherthanthatoftheinitialbatteryvoltage.
RefertotheBatteryVoltageT able(page6–16)foranexampleofacharging
systemthatisfunctioning.
Groundsmaster
®
3280-D/3320
Page6–15
ElectricalSystem:ElectricalSystemQuickChecks
05138SLRevB
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