New Holland TMF 98 – TMF Controller: Battery Voltage is too Low
Issue description
The 12VD voltage supply to the controller drops below 8 volts.
Applies to these machines
3 machines- New Holland T8000 Series (T8010, T8020, T8030, T8040, T8050)
- New Holland TG Series (TG215, TG245, TG275, TG305)
- New Holland T9 Series
Check the cause
Check for concurrent fault codes (ARM 8011, AUX/Hitch/PTO 65, 66, 99, or TRANS 70) indicating a systemic battery/charging issue
Measure voltage directly at the battery terminals (should be >12 VDC resting, 12-14 VDC running)
Verify the alternator regulator output is actively charging the battery
Check system voltage directly at the TMF controller's power and ground connections to rule out voltage drop through the harness
Repair steps
Charge the Battery
Put a battery charger on the battery to bring it up to a full charge before starting the tractor. Clear the codes and see if TMF 98 returns.
Clean Connections
Clean the battery terminals, chassis ground connections, and the harness connectors at the TMF controller to ensure there is no corrosion causing a voltage drop.
Replace the Battery
If the battery fails a load test or will not hold a charge above 12 volts, replace it.
Repair/Replace the Alternator
If the tractor is running but the alternator is not outputting 13.5V–14.5V to the battery, replace the alternator or rebuild it using an alternator repair kit.
Harness Repair
If the battery and alternator are functioning perfectly but the TMF controller is receiving less than 8 volts, trace the wiring harness for open circuits, chafing, or shorts to ground and repair as necessary.
Replace the TMF Controller
If the controller is receiving proper voltage but still internally logging a low-voltage fault, the TMF module itself has failed and must be replaced or sent out for remanufacturing.
Parts you might need
(19)Battery (12V Wet Battery)
F770DSWGroup size and CCA will vary by specific tractor model.
Alternator (12V, High Output / 200 Amp)
87715398Bosch, Iskra, or Marelli (depending on exact tractor configuration).
Alternator (12V, High Output / 200 Amp)
87439319Bosch, Iskra, or Marelli (depending on exact tractor configuration).
Alternator (12V, High Output / 200 Amp)
87677207Bosch, Iskra, or Marelli (depending on exact tractor configuration).
Alternator (12V, High Output / 200 Amp)
87645567Bosch, Iskra, or Marelli (depending on exact tractor configuration).
Alternator (12V, High Output / 200 Amp)
87418226Bosch, Iskra, or Marelli (depending on exact tractor configuration).
Alternator (12V, High Output / 200 Amp)
87418225Bosch, Iskra, or Marelli (depending on exact tractor configuration).
Alternator (12V, High Output / 200 Amp)
87645566Bosch, Iskra, or Marelli (depending on exact tractor configuration).
Alternator Repair Kit
84310284New Holland Alternator Repair Kit
TMF Controller (Tractor Multi-Function Module)
51563039Part numbers vary heavily based on the tractor's transmission speed (e.g., 42 KPH vs 50 KPH) and connector count (e.g., 5-connector vs 6-connector modules).
TMF Controller (Tractor Multi-Function Module)
87393065Part numbers vary heavily based on the tractor's transmission speed (e.g., 42 KPH vs 50 KPH) and connector count (e.g., 5-connector vs 6-connector modules).
TMF Controller (Tractor Multi-Function Module)
87567066CPart numbers vary heavily based on the tractor's transmission speed (e.g., 42 KPH vs 50 KPH) and connector count (e.g., 5-connector vs 6-connector modules).
TMF Controller (Tractor Multi-Function Module)
51563038Part numbers vary heavily based on the tractor's transmission speed (e.g., 42 KPH vs 50 KPH) and connector count (e.g., 5-connector vs 6-connector modules).
TMF Controller (Tractor Multi-Function Module)
87364402Part numbers vary heavily based on the tractor's transmission speed (e.g., 42 KPH vs 50 KPH) and connector count (e.g., 5-connector vs 6-connector modules).
TMF Controller (Tractor Multi-Function Module)
87615859Part numbers vary heavily based on the tractor's transmission speed (e.g., 42 KPH vs 50 KPH) and connector count (e.g., 5-connector vs 6-connector modules).
TMF Controller (Tractor Multi-Function Module)
87339221Part numbers vary heavily based on the tractor's transmission speed (e.g., 42 KPH vs 50 KPH) and connector count (e.g., 5-connector vs 6-connector modules).
TMF Controller (Tractor Multi-Function Module)
87355268Part numbers vary heavily based on the tractor's transmission speed (e.g., 42 KPH vs 50 KPH) and connector count (e.g., 5-connector vs 6-connector modules).
TMF Controller (Tractor Multi-Function Module)
87364379Part numbers vary heavily based on the tractor's transmission speed (e.g., 42 KPH vs 50 KPH) and connector count (e.g., 5-connector vs 6-connector modules).
TMF Controller (Tractor Multi-Function Module)
87524908CPart numbers vary heavily based on the tractor's transmission speed (e.g., 42 KPH vs 50 KPH) and connector count (e.g., 5-connector vs 6-connector modules).
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