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No display, no travel, no lift

Hi Guys, I have a Toyota 7FBEU20 and all of the sudden when backing out of a lift the display went dark and no travel or lift functions working. The back up alarm, horn and strobe light are still working. I have checked all fuses, including the fuse under the passenger side step - all good. the battery is fully charged and has 48v at the connector when unplugged. When battery is plugged in there is only 10v. I removed battery and checked all cables under the tray - all good. I removed the truck side battery cables from the main contactor and pump controller and the voltage reads 48v. Wondering if I have a controller issue? Any Ideas?
  • Posted 13 Dec 2023 08:50
  • By Scott_Palmer
  • joined 7 Sep'22 - 4 messages
  • Ontario, Canada
Scott Palmer
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I would check for short to ground and short to frame from battery. Then reconnect motor controller and test contactor...if tests good reconnect and check ignition switch and all fuses...have had fuses good but wires behind fuses with shorted wires in the past also. If you have a good battery in another truck...pull good truck next to backwards and hook good battery up...if it works..short to frame or ground through battery
  • Posted 15 Dec 2023 16:22
  • By Matthew_Reed
  • joined 12 Jun'23 - 113 messages
  • New York, United States
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So, you say the battery shows only 10 volts when you plug it in? If you're measuring at the connector, compare the voltage before the battery connector to the after truck connector. Stab the cables if necessary.
  • Posted 15 Dec 2023 00:53
  • By ErichO
  • joined 26 Oct'21 - 83 messages
  • Washington, United States
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Fact of the week
In 1923, French tennis player René Lacoste was promised a crocodile leather suitcase by his captain if he won his next match. He lost the match but won the nickname "the crocodile" which he had sown onto his tennis attire. Ten years later he launched the first polo shirt and Lacoste, the first brand to feature a logo on its clothing.