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FuelPumpRelay(Groundsmaster3320)

g223021

Figure173

1.Coilterminal

3.Normallyopenterm

2.Normallyclosedterm

4.Commonterminal

TheGroundsmaster3320usesarelaytoenergizethefuelpump.Thefuel

pumprelayisattachedtothesupportbracketinsidetherightsideframenear

thefuellter.

TestingtheFuelPumpRelay

Note:Priortotakingsmallresistancereadingswithadigitalmultimeter,short

themetertestleadstogether.Themeterwilldisplayasmallresistancevalue

(usually0.5ohmsorless).Thisresistanceisduetotheinternalresistanceof

themeterandtestleads.Subtractthisvaluefromthemeasuredvalueofthe

componentyouaretesting.

1.Locaterelayanddisconnectthemachinewireharnessconnectorfromthe

relay.

2.Usingamultimeter(ohmssetting),measurecoilresistancebetweenterminals

85and86(Figure173).Resistanceshouldbebetween70and90ohms.

3.Connectmultimeter(ohmssetting)leadstorelayterminals30and87.

Groundterminal86andapply+12VDCtoterminal85.Therelayshould

makeandbreakcontinuitybetweenterminals30and87as+12VDCis

appliedandremovedfromterminal85.

4.Disconnectvoltagefromterminal85andmultimeterleadfromterminal87.

5.Connectmultimeter(ohmssetting)leadstorelayterminals30and87A.Apply

+12VDCtoterminal85.Therelayshouldmakeandbreakcontinuitybetween

terminals30and87Aas+12VDCisappliedandremovedfromterminal85.

6.Disconnectvoltageandmultimeterleadsfromtherelayterminals.Connect

relaytomachinewireharness.

Groundsmaster

3280-D/3320

Page6–75

ElectricalSystem:TestingtheElectricalComponents

05138SLRevB

Toro 30403 Service Manual

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