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2004 Cat 420D backhoe

chadflakne ยท 2023-08-28 16:52

I have a 420D backhoe that starts as soon as you put key in on position. the starter will not stop running tell you remove the relay. ive seen other posts about lift pump diodes. but havent been able to locate any that cured my problem. looking for advice or a wiring diagram of backhoe. any advice would be greatly appreciated. serial number CRS01299LI301810 PRODUCT IDENTIFICATION NUMBER CAT0420DVFDP18558

Replies3
  1. #1CM19952023-08-28 18:38

    Welcome to the Forums Chad! Glad to have you.

  2. #2heymccall2023-08-28 18:59

    Schematic

  3. #3heymccall2023-08-28 19:02

    Reading schematic, that sure looks like the logical place to start.