Jump start cautions for starters and alternators

Jump start cautions for starters and alternators

With the onset of cold weather, it's even more important to protect starters and alternators. The Technology and Maintenance Council has provided the following advice for fleets.

With the onset of cold weather, it is even more important to protect starters and alternators. The Technology and Maintenance Council has provided the following advice for fleets:

Impact on starters from jump starts:
Repeated attempts to start a vehicle using batteries with a low state-of-charge can damage a starter motor. Insufficient voltage and current at the solenoid terminals [switch (50) or S-terminal and the switch (30) or battery post] also can cause starter damage or failure. Prolonged and/or continuous cranking at low levels can cause slow cranking that generates heat and damages internal components. As a rule of thumb, no starter should be cranked for more than 30 seconds, and the operator should wait at least two minutes before attempting another crank. Jump starting at voltage levels higher than the system voltage of the vehicle being started also can cause issues. Increased voltage will result in increased armature acceleration, excessive torque on the ring gear and pinion and other damage. This also can cause thermal loading of the current carrying components of the starter.

Impact on alternators from jump starts:
The alternator’s design makes it fairly impervious to negative effects from jump starting. However, the alternator can sustain instant damage if the polarity of the clamp connections is mistakenly reversed. The diode trio and the diodes in the bridge are not designed to handle voltage and current delivered in the reverse direction. The alternator’s output terminal and ground are not good connection points for clamps when jump starting a vehicle. Although these cables typically go directly to the starter, the circuits are designed to handle lower charging current levels, not high cranking current levels. This increased current load can cause excessive voltage drop (reduced cranking speed), or if the circuit is fused, could trip the fuse, resulting in an open circuit. As a result, the batteries could not be charged.

Training for vehicles equipped with gear-reduction starter motors:
In the past, drivers started a vehicle by turning a key, which activated a small relay; this, providing power to the starter solenoid. However, starting sequences on today’s trucks are more complicated so fleets must educate drivers to re-think the starting process to avoid costly damage and breakdowns.

You May Also Like

Carrier hybrid unit offers reduced weight, improved fuel economy

Advantages of Carrier Transicold’s new Vector 8500 single-temperature hybrid trailer refrigeration unit include less weight, better capacity and improved fuel efficiency, according to the company.

Advantages of Carrier Transicold’s new Vector 8500 single-temperature hybrid trailer refrigeration unit include less weight, better capacity and improved fuel efficiency, according to the company. With the Vector 8500, Carrier is also introducing a fully hermetic electric scroll compressor, used in refrigerated marine container systems, that has 70 percent fewer moving parts and is 200 lbs lighter than a traditional reciprocating compressor. The Carrier Transicold Vector 8500 incorporates the manufacturer’s ecoFORWARD technologies. Compared to the unit it succeeds, the new Vector 8500: • Weighs 210 lbs less, a 10 percent weight savings; • Provides up to 4% higher cooling capacity – 60,000 BTU at 35 degrees F and 24,000 BTU at -20 degrees F; • Consumes up to 26% less fuel over a full range of operating conditions; and • Reduces engine runtime by up to 14%. In start/stop mode, according to Carrier, the greater capacity and higher efficiency also help the Vector 8500 achieve setpoint faster, enabling the engine to shut off sooner, ultimately reducing engine run hours and runtime-based maintenance expenses. The Vector 8500 unit’s engine is certified for the 2013 EPA Tier 4 standard for engines less than 25 HP. For fleets operating in California beyond seven years, the Vector platform’s standard electric standby capability provides an in-use compliance option.

Digital Abex air disc brake catalog now available

A new digital catalog featuring the expanded Abex line of replacement air disc brake pads for commercial vehicles is now available from Federal-Mogul.

Peterbilt showcases advanced technologies

During the annual Energy Summit and Fair held on the campus of the University of North Texas (UNT), home of the PACCAR Technology Institute, Peterbilt Motors Co. displayed the SuperTruck advanced concept vehicle it is developing with Cummins Inc. through a U.S. Department of Energy program.

PIT compares 6×2 and 6×4 tractors

Evaluations comparing 6×2 and 6×4 trucks by FPInnovations’ Performance Innovation Transport (PIT) group showed that 6×2 tractors consume less fuel than similar 6×4 tractors.

Thermo King integrates TracKing Telematics Solution with Add On Systems

The TracKing web-based, refrigerated trailer and temperature monitoring system from Thermo King can now be integrated with AS400/iSeries software for the truckload carrier market from Add On Systems (AOS) Inc.

Other Posts

Eight tips to prepare your trucks for winter

Like it or not, winter is coming. You know the drill: falling temperatures, snow, and ice hitting large swaths of North America, presenting challenges for trucks and fleets. Now is the time to prepare. With harsh weather looming, this installment of the Bendix Tech Tips Series serves up eight pieces of advice for wheel-ends, air

generic-snow-road-bad-weather
Tech Tip: How often is lift maintenance needed?

Even the most rugged, low-maintenance lifts need attention from time to time. Related Articles – P.S.I. extends partnership with Celerity DRS for Europe – PrePass Safety Alliance announces new president – VIPAR Heavy-Duty lists 2022 charitable causes Give your lift a once-over every day before you use it, check the safety devices, operating controls, lift

Bendpak-XPR-18C
Tech Tip: Be your own cable guy

When was the last time you checked the cables on your shop’s lifts? If you answered “today,” good for you! Cables are one of the things you should check before using your lift every day. In this article, we’ll explore how to maintain your lift cables or “wire ropes,” how to look for damage, and

bendpak-rope-damage
Tech Tip: Troubleshooting your two-post lift

Your lift is critical to the operation and profitability of your business. If it stops working correctly, it’s costing you money. Let’s take a look at how to troubleshoot some common issues and get your lift back to work. Remember to check your owner’s manual for details about your specific lift. Related Articles – Trucking

BendPak-Lifts