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Deere 21glc excavator charging issues

chester7 ยท 2025-02-24 14:30

New alternator and batteries, batteries sit at 24.9 v, doesn't change when running, but does not discharge batteries they stay at24.9 v any ideas? Getting frustrated.

Replies5
  1. #1Diesel Dave2025-02-24 15:23

    Welcome to HEF chester . You have a full machine serial # ?

  2. #2chester72025-02-24 18:11

    Here is s#1ff210gxanf530405 , have checked as many grounds as possible, found relays behind seat but none marked, fuses good.

  3. #3Vetech632025-02-24 18:21

    Did you measure voltage at the alternator output?

  4. #4chester72025-02-25 09:20

    Yep, getting 24.8 v, have tried 2 other alternator, as well, it's kicking my ass, don't have a schematic, so chasing wires, any idea if one of relays behind the seat may be for alternator?

  5. #5Vetech632025-02-25 10:41

    Its sounds like your alternator isn't being excited to me. Can you post a pic of the wiring at the alternator?