Results 1 to 4 of 4
  1. #1
    Join Date
    Jun 2017
    Location
    US
    Posts
    6
    Rep Power
    0

    Carrier Supra 550 Starting Issue



    Hi All,

    I have a supra 550 with a strange issue. When you turn it on, the electric fuel pump engages, you hear the unit buzzing but it never cranks and then the evap fans come on. It will start if you use the manual crank switch next to the relay box or if you jump the starter but it won't start on its own. Checked all relays, fuses and for broken/corroded wires, all seems well. Also swapped cab command, relay board and micro from another unit and it's still doing the same thing.

    Any help would be greatly appreciated.

    Thanks!



  2. #2
    Join Date
    Feb 2009
    Location
    telford
    Posts
    2,097
    Rep Power
    33

    Re: Carrier Supra 550 Starting Issue

    Could be the alternator,because when the alternator starts to charge that's how it knows it's running try searching the field wire to the alternator

  3. #3
    Join Date
    Feb 2009
    Location
    telford
    Posts
    2,097
    Rep Power
    33

    Re: Carrier Supra 550 Starting Issue

    Damn spellchecker should read try earthing the field wire at alternator then try to start

  4. #4
    Join Date
    Jun 2017
    Location
    US
    Posts
    6
    Rep Power
    0

    Re: Carrier Supra 550 Starting Issue

    Thank you! Turns out there was a broken wire in the alternator harness that was missed on initial inspection. No idea how it happened considering it looks like it was cut and was pretty deep inside harness...no corrosion or anything... but it's fixed.

    Thanks Again.

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •