Installation Manual

II71E
Page 2 of 2
C. E. Niehoff & Co. • 2021 Lee Street • Evanston, IL 60202 Tech Services Hotline [phone]
4. Belttensionguidelinesshownbelowareastarting
pointformanualandautomaticbelttensioners.
• K-sectionpulley:8groovesminimum,
 10groovespreferred.
 • Beltwrap:180degreenominal.Lesswrap
 requiresapulleywithmoregroovesand 
 morebelttension.
 • Belttension:80lbsto120lbsnominal.More
 pulleygroovespermitlowerbelttension.
 Forfurtherquestions,pleasecontactdrivebelt
manufacturer.
 Eithertoolowandtoohighbelttension
 causesprematurebearingfailure.Too
 lowbelttensioncausesbeltslip,pulley
 heating,bearingheating,andultimately
 bearingfailure.Toohighbelttension
 increasesbearingfatigue,resultingin
 bearingfailure.
5. Regulatorelectricalconnections:
a. Makesurealternator-to-regulatorharnessplug
 issecureinregulatorreceptacle.
 b. ConnectIGNterminalonregulatortoignition
 sourcethroughoilpressureswitch,using
 properringterminal.Torque#10-24terminal
 nutto3.4Nm/30lb.in.TorqueM5terminalnut
 to4.5Nm/40lb.in.
 c. ConnectPterminaltotachometerorrelay.
 PterminaltapsACvoltage,typicallyhalfthe
 chargevoltage.Useproperringterminal.
 Torque1/4-20terminalnutto3.4Nm/30lb.in.
 TorqueM6terminalnutto4.5Nm/40lb.in.
 d. D+terminalprovides28VDCsensevoltageto
 multiplexcontroller.WhenconnectingD+
 terminaltocontrollerthrougharelay,therelay
 coilmustbediodeprotectedandratedfor
 propervoltage.Useproperringterminal.
 Torque1/4-20terminalnutto3.4Nm/30lb.in.
 TorqueM6terminalnutto4.5Nm/40lb.in.
6. Alternatorelectricalconnections:
a. Connectbatterypositivecablefromvehicleto
 alternatorB+terminal.TorqueB+terminalon
 alternatorto30Nm/22lb.ft.Torquecable
 clamphardwareto10Nm/90lb.in.
 B+cablemustbesupportedby
 cableclampwithin12in.ofB+
 outputterminaltoavoidprema-
 turefailureofB+outputterminal.
 CENrecommendsusingcable
 clampattachedtoalternatoranti-
 driveendhousingforsupport.
 b. Connectgroundcablefromvehicletoalternator
 B–terminal.TorqueB–terminalonalternator
 to15Nm/11lb.ft.
7. Alternatoroutputtest(conduct test with fully
charged batteries):
a. Turnon28-voltbatterysystemandstart
 engine.
 b. Turnonallvehicleloads,includinginterior/
 exteriorlightsandairconditioning.
 c. Measurevoltageatalternator.Voltagereading
 shouldbe27.6–28.0Vonlowsettingof 
 regulatorand28.5–29.0Vonhighsetting.
 SeeCENTroubleshootingGuidesforfurther
 information.
 d. Checkbatterycablevoltagedrop.Thereshould
 benomorethan0.4Vdropon each legfrom
 alternatortobattery.
 e. Roadtestvehicleforabout20minutes.
 f. Followingroadtest,repeatoutputtest.
  Regulatorsusedwiththesealternators
  featureovervoltagecutout(OVCO),which
  disablesalternatoroutputinanovervoltage
  condition.RestartingengineresetsOVCO
  circuit.Whenanovervoltageconditionisno
  longerpresent,alternatorandregulator
  shouldoperatenormally.Ifano-outputcon-
  ditionshouldoccur,followaboveresetpro-
  ceduretodetermineifOVCOtripiscause.
CAUTION
CAUTION
WARNING