Prestolite technology protects engines from stray voltage

July 19, 2017

Prestolite Electric recently pioneered the use of “Isolated Ground Technology,” which protects engines from potentially severe electrolytic damage caused by stray voltage, in its line of IdlePro and IdlePro Extreme alternators.

“As original equipment manufacturers push to reduce stray electrical current or ground noise flowing through the engine to prevent premature engine failures and related component failures, this latest technology from Prestolite Electric ensures industry-best performance,” said Nick Laenen, vice-president, North America, South America, Australia sales and marketing, Prestolite Electric. “Isolated Ground Technology maintains a closed loop of electric current, reducing both the alternator’s electronic noise signature and preventing stray electrical currents grounding through the engine block or its related parts.”

Isolated Ground Technology, a technology that helps to prevent overall associated component failure and vehicle downtime, includes a dedicated cable that directs the electric current from the battery to the alternator and a second dedicated electrical cable that directs the electric current from the alternator back to the battery.

More common alternator designs allow the case of the alternator to be part of the electrical circuit. When an alternator is anchored to the engine electric current can then travel through or along the engine, increasing the opportunity for engine electrolysis or electronic noise interfering with other electronic equipment on the engine or vehicle. In today’s modern engines, the added electronic noise can trip ghost error codes – necessitating a service incident and diagnostic troubleshooting.  

Laenen said: “In today’s commercial vehicle landscape, as we seek out ways to optimize our fleet and increase ‘uptime,’ this technology is integral in the protection of one of the truck’s most critical assets--the engine. We’re at the forefront of research and design, utilizing our global engineering reach through the Broad-Ocean Motors brand and our relationships with the world’s leading heavy duty engine designers and manufacturers to develop technologies that are answering tomorrow’s needs today.”

Assembled in the United States, the new Leece-Neville IdlePro and IdlePro Extreme high-efficiency/high-output alternators include Isolated Ground and an array of other exclusive technologies that help extend battery life and increase vehicle uptime by enhancing electrical system and engine performance. The company plans to add the feature to the PowerPro and PowerPro Extreme series high-torque starters in the near future.

To learn more about Isolated Ground Technology or other Leece-Neville products, please visit