When To Use This Document

Use this document when you need to measure the power system voltage on a Jaco EVO Cart, as instructed by a Jaco Support Technician. This will help us pinpoint the specific issue and quickly resolve the issue.


  • It is recommended to be near a wall AC outlet during the troubleshooting. 
  • Always unplug the recharge cord from the wall outlet before disconnecting any wire connectors on the power system.
  • Record battery voltage measurements as instructed to pinpoint failed component. If a voltmeter is not available, JACO can provide a Jvolt-kit. The kit consists of a voltmeter with 10 pin adapter cable. E-mail us at support@jacoinc.com to request a Jvolt-Kit.

Tools Needed

  • Volt Meter


Open Inverter Bay

Loosen thumb screw to open the right side inverter cover

Configure Volt Meter

Voltage Meter Settings

  • Set Voltmeter to measure DC(Direct Current) as shown
  • Verify the BLACK meter lead is plugged into COM and RED meter lead is plugged into V
  • If voltmeter battery is low, it may give incorrect readings


OCV & Recharge Voltage

Open Circuit Voltage (OCV):

  1. Insert the RED meter lead into the Bottom-Right located on the battery connector as shown above.
  2. Insert the BLACK meter lead into the Bottom-Left position located on the battery connector as shown above.
  3. Record this reading as OCV = ____

Charge Voltage(CV):

  1. Keep the meter leads in place as the Battery OCV step. Plug the Recharge Cord into the Wall Outlet.
  2. Record this reading as CV= ____
  3. Does the FAN spin? ____

Note: Recharge voltage should be higher than the Battery Voltage.

Battery Measurements Results, Tips, and Examples

Results and Analysis

Please report your OCV and CV voltage readings to JACO Support for further assistance.