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Charging System (Old Style): Other GMC Yukon Denali

Charging System 1 illustration ~1299 words

BELT TENSION

Note. Drive belt tension is controlled by a belt tensioner. No adjustment is required.

BATTERY IS UNDERCHARGED OR OVERCHARGED

  1. Perform «CHARGING SYSTEM TEST»(ref-4114-S19577470342000061200000). Go to next step.
  2. Turn off all accessories. Make sure generator 4-way connector is connected. Start engine and run at 2500 RPM. Using a DVOM, measure voltage across battery terminals. If voltage is 13-16 volts, go to next step. If voltage is not 13-16 volts, go to step 4.
  3. Turn engine off. Check battery electrical drain/parasitic load. If parasitic load is less than.022 amp, system is good. If parasitic load is more than.022 amp, locate source of drain and repair. See «WIRING DIAGRAMS»(ref-4114-S20905778022000061200000).
  4. If voltage across battery was too low, go to next step. If voltage across battery was not too low, go to step 7.
  5. Disconnect generator connector. Turn ignition on. Using a DVOM, check voltage at terminal "B" (Brown wire) of generator connector. If voltage is greater than 12 volts, go to next step. If voltage is not greater than 12 volts, go to step 8.
  6. Check Brown wire between generator and instrument cluster for an intermittent short or poor connection. See «WIRING DIAGRAMS»(ref-4114-S20905778022000061200000). If Brown wire is good, go to step 9. If problem was found, repair as necessary and retest system.
  7. Check generator connector for mis-wired condition. Cavity "D" should not have a wire in it. After repair, retest system.
  8. Using a DVOM, backprobe instrument panel connector terminal No. 19 (Brown wire). (Scheme 6) Turn ignition on. Measure voltage at instrument panel connector terminal No. 19. If voltage is above 12 volts, repair Brown wire between generator and instrument cluster. See «WIRING DIAGRAMS»(ref-4114-S20905778022000061200000). If voltage is less than 12 volts, repair instrument panel cluster as necessary. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. Retest system.
  9. Disconnect negative battery cable. Disconnect and clean all connections between battery positive terminal and generator output terminal. Check all cables for intermittent open condition. Disconnect and clean all connections in ground circuit between negative battery terminal and generator housing. Reconnect all connections. Reconnect negative battery cable. Retest system.

Scheme 6

Scheme 6
Scheme 6

CHARGE INDICATOR LIGHT ALWAYS ON

  1. Ensure ignition is off. Disconnect generator connector. Turn ignition on. If charge indicator light is off, go to next step. If charge indicator light is on, go to step 3 .
  2. Replace generator. See «GENERATOR»(ref-4114-S37292120222000061200000) under REMOVAL & INSTALLATION. Recheck system.
  3. Check for short or bad connector in Brown wire between generator and instrument cluster terminal No. 19. See «WIRING DIAGRAMS»(ref-4114-S20905778022000061200000) . Repair as necessary. Recheck system.

CHARGE INDICATOR LIGHT INOPERATIVE

  1. Disconnect generator connector. Using a fused jumper wire, connect generator harness connector terminal "B" (Brown wire) to ground. Turn ignition on. If charge indicator light illuminates, go to step 4. If charge indicator light does not illuminate, go to next step.
  2. Disconnect instrument panel connector. Turn ignition on. Check voltage between instrument panel harness connector terminal No. 22 (Pink wire) and ground. (Scheme 6) If voltage is 12 volts or more, go to step 5. If voltage is less than 12 volts, go to next step.
  3. Repair open in Pink wire between instrument panel and fuse block. See «WIRING DIAGRAMS»(ref-4114-S20905778022000061200000). Recheck system.
  4. Replace generator. See «GENERATOR»(ref-4114-S37292120222000061200000) under REMOVAL & INSTALLATION. Recheck system.
  5. Connect a jumper wire between instrument panel cavity terminal No. 22 and battery voltage. Also, connect a jumper wire between instrument panel cavity terminal No. 19 and ground. (Scheme 6) If charge indicator light illuminates, go to step 7. If charge indicator light does not illuminate, go to next step.
  6. Replace instrument cluster. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. Recheck system.
  7. Repair open in Brown wire between instrument panel and generator. See «WIRING DIAGRAMS»(ref-4114-S20905778022000061200000). Recheck system.

GENERATOR NOT OPERATING PROPERLY

  1. Perform «CHARGING SYSTEM TEST»(ref-4114-S19577470342000061200000) . Go to next step.
  2. Turn ignition off. Using CS Electronic Generator Tester (J41450-B), connect Red lead to generator output terminal and Black lead to metal generator housing. If Green POWER lamp is not on, go to next step. If Green power lamp is on, go to step 5 .
  3. Check Red wire between generator output terminal and battery positive terminal for opens or poor connections. See «WIRING DIAGRAMS»(ref-4114-S20905778022000061200000) . If problem was found, repair as necessary and recheck system. If problem was not found, go to next step.
  4. Repair generator ground circuit between generator housing and battery negative terminal for opens or poor connections. See «WIRING DIAGRAMS»(ref-4114-S20905778022000061200000) . Recheck system.
  5. Leave Red and Black leads of CS electronic generator tester attached. Disconnect generator connector. Locate matching connector on tester and connect it to generator. Red DIAGNOSTIC lamp should light. Prior to connecting carbon pile tester, be sure load dial is turned completely to OFF position. Connect carbon pile tester to battery. Connect inductive ammeter to output circuit of generator. Start engine and allow to idle. If Red DIAGNOSTIC lamp is not on, go to next step. If Red DIAGNOSTIC lamp is on, go to step 11 .
  6. Increase engine speed to 2500 RPM. If Red DIAGNOSTIC lamp is not on, go to next step. If Red DIAGNOSTIC lamp is on, go to step 11 .
  7. Maintain engine speed at 2500 RPM. Turn on load of carbon pile tester and increase load until generator output is equal to load test value (K60 is 70 amps; K68 is 73 amps; KW2 is 86 amps; KG9 is 98 amps). If generator is capable of producing load test current, go to next step. If generator is not capable of producing load test current, go to step 11 .
  8. Maintain engine speed at 2500 RPM and continue to operate generator at load test value. If Red DIAGNOSTIC lamp is not on, go to next step. If Red DIAGNOSTIC lamp is on, go to step 11 .
  9. Maintain engine speed at 2500 RPM and continue to operate generator at load test value. Using a DVOM, measure voltage drop between generator output terminal and positive battery terminal. If voltage drop is less than 0.5 volt, go to next step. If voltage drop is more than 0.5 volt, go to step 13 .
  10. Maintain engine speed at 2500 RPM and continue to operate generator at load test value. Using a DVOM, measure voltage drop between generator metal housing and negative battery terminal. If voltage drop is less than 0.5 volt, disconnect DVOM, turn OFF load in carbon pile tester and turn engine off. Disconnect carbon pile tester and CS electronic generator tester from generator. Reconnect generator connector and retest system. If voltage drop is more than 0.5 volt, go to step 14 .
  11. Turn ignition on. Connect a 5-amp fused jumper between generator connector terminal "L" and ground. If fuse blows, go to next step. If fuse does not blow, go to step 15 .
  12. Brown wire is shorted to power with ignition on. Repair short to power in Brown wire between generator connector and instrument cluster, or within instrument cluster. See «WIRING DIAGRAMS»(ref-4114-S20905778022000061200000) . After repair, go to step 15 .
  13. Turn ignition off. Disconnect negative battery cable. Disassemble and clean all connections in Red wire between generator battery terminal and positive battery terminal. See «WIRING DIAGRAMS»(ref-4114-S20905778022000061200000) . Reassemble all connections. Connect negative battery cable. Retest system.
  14. Turn engine off. Check ground circuit between generator housing and negative battery terminal for high resistance. See «WIRING DIAGRAMS»(ref-4114-S20905778022000061200000) . Disassemble and clean all connections. Reassemble connections. Connect negative battery cable. Retest system.
  15. Replace generator. See «GENERATOR»(ref-4114-S37292120222000061200000) under REMOVAL & INSTALLATION. Retest system.

VOLTMETER DISPLAYING HIGH OR LOW

  1. Start engine. Using a DVOM, measure voltage across battery terminals. If voltage is 12-16 volts, go to next step. If voltage is not 12-16 volts, go to step 3 .
  2. Replace instrument cluster. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. Recheck system.
  3. Replace generator. See «GENERATOR»(ref-4114-S37292120222000061200000) under REMOVAL & INSTALLATION. Recheck system.

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