voltage Archives - UnderhoodService
VIDEO: Weak Battery? Don’t Reflash

A power supply to keep the voltage consistent is required. This video is sponsored by Auto Value and Bumper to Bumper.

Understanding Five Volt Reference Signals

A 5-volt reference flows through a sensor with a resistance that varies according to changes in temp., pressure or position.

VIDEO: Module Communication Codes? Check The Alternator

Andrew Markel talks about AC voltage and what to test for when module communication codes appear while a vehicle is on the road. Sponsored by Auto Value and Bumper to Bumper.

VIDEO: Checking Battery Health Before Module Programming

Andrew Markel discusses programming modules on a vehicle, and the importance of checking the health of the battery before performing the procedure. Sponsored by Nissan.

VIDEO: Checking The Voltage On A Fuel Pump

Andrew Markel explains how modern vehicles have pressure sensors that send out a voltage signal, and how a diagnosis can be made by measuring the signals with a scope. Sponsored by Auto Value and Bumper to Bumper.

Alternator Testing: What Is The Correct Voltage?

For some alternators, it’s normal to see as low as 13 volts. For some, a constant 13.6 volts is an indication of a problem. For others, it’s normal to see as high as 16 volts for long stretches. Still, it’s perfectly normal for others to see the alternator not charge at all intermittently.