Toyota 7FBU30:
False Battery indicator

Unit is showing only 2 bars of power on the dash with fresh charged over night. Operates well for a couple hours and then needs to be charged due to lift cut out.

80 volt unit. Fresh charge 85 to 86 volts. Loads to 71 with lift and hard plugging. Battery 3 months old. Good water and gravity. All cells good. I believe this battery is up to par.

My theory is that there is a setting in the unit for the battery state of charge, and that is making the computer think 85 volts is dead. Is there such a thing on a toyota?
  • Posted 15 Jun 2013 12:38
  • Discussion started by Othell
  • Texas, United States
Showing items 1 - 7 of 7 results.
Just looked at Ed's reply and he is right about voltage drop. What I do is check each cell while in tilt bypass. You should be able to locate the bad cell or cells that way.
  • Posted 18 Jun 2013 10:55
  • Reply by rogeriwt
  • Massachusetts, United States
Just looked at Ed's reply and he is right about voltage drop. What I do is check each cell while in tilt bypass. You should be able to locate the bad cell or cells that way.
  • Posted 18 Jun 2013 10:24
  • Reply by rogeriwt
  • Massachusetts, United States
How long have you had the units? I have seen factory settings be wrong for the trucks and adjustments need to be made for the type of battery in the truck. Do you equalize charge your batteries?
  • Posted 18 Jun 2013 10:14
  • Reply by rogeriwt
  • Massachusetts, United States
Ok thanks. Ill go over the batteries again.
  • Posted 16 Jun 2013 10:13
  • Reply by Othell
  • Texas, United States
it may well be both units have bad batteries. it takes more power/current to lift to dead head than to lift and drive.
As I use it here, "phase" has to do with the AC input lines, (sometimes called the mains) and includes the input line fuses and should be an voltage equal reading between any 2 of the 3 main lines if it is a 3 phase AC, and that number should be at the number the jumpers are set at.
As far as how you read it; with one hand in your pocket and with training in how to work on AC power lines (might be a good time to call an electrician, if in the USA, for insurance reasons).
  • Posted 16 Jun 2013 08:24
  • Reply by edward_t
  • South Carolina, United States
"it's not rocket surgery"
Just lifting dead headed would be more around 78-79 volts. I've never checked chargers. Does phase have to do with where the jumpers are installed? How would I check the input power?

I know there are twin units there with different batteries and chargers. They are having the same issue with both.
  • Posted 16 Jun 2013 06:30
  • Reply by Othell
  • Texas, United States
there are settings in most BDIs to set for the "ramp" of the discharge, but if your battery drops from 85 VDC at rest to 71 vdc under load (and don't try to read it when moving, just lifting to max lift and hydraulic stall for less than 4 seconds) you have a bad battery, or at least a bad cell. (10% voltage drop=needs battery checked [85vdc minus 71vdc= 14vdc > 8.5vdc=10% of 85vdc])
is your charger a 3phase A/C, and are all 3 phases equal input power?
  • Posted 15 Jun 2013 21:13
  • Modified 15 Jun 2013 21:14 by poster
  • Reply by edward_t
  • South Carolina, United States
"it's not rocket surgery"

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