Electrical Archives - Page 4 of 55 - UnderhoodService
Coil On Plug Ignition: The Wired Differences

For late-model vehicles, the norm is one ignition coil per cylinder, commonly known as coil on plug. The task of providing voltage potential to each spark plug is performed so reliably that it’s easy to take for granted.

Electronic Throttle: Where’s The Cable?

Today, virtually every manufacturer has an electronic throttle system on board every make and model. That old throttle cable is a thing of the past.

VIDEO: Check The Battery When Replacing The Alternator

Andrew Markel stresses the importance of checking the battery during an alternator replacement job, and replacing it if it is worn out or will not accept a charge. Sponsored by DENSO.

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VIDEO: Diagnosing Failing And Unresponsive Relays

Andrew Markel explains how to diagnose relays that are failing or unresponsive. Sponsored by Standard.

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Mercedes-Benz HD Projector Headlights: The Next Headlight Innovation

Mercedes-Benz is working on the latest generation of headlights that could change the way we drive at night. This new technology turns headlights into digital projectors that not only project light, but also images to aid the driver and pedestrians.

Catching The Electron Flow: Multimeters And Fuse Box Diagnostics

Gary Goms explains why the multimeter is the first tool he reaches for in his diagnostic tool box when diagnosing electrical system problems.

VIDEO: Three Tips For Your Next Alternator Installation Job

Andrew Markel goes over the proper installation procedure for a brand new alternator. Sponsored by DENSO.

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Troubleshooting And Sorting Out Multiple DTCs At The Penny Arcade

It is late Thursday afternoon in mid-May and tourist season is just beginning in Colorado’s High Country. After finishing one mobile diagnosis, I was asked to look at another – a 2003 Honda Element with a no-cranking condition that had just been dropped off at my client shop’s busy parking lot by an owner who was now stranded 2,000 miles away from home.

VIDEO: Diagnosing The Starter With A Voltage Drop Test

Andrew Markel shows how to voltage drop test a starter when there is a slow crank, despite the battery and starter having enough voltage. Sponsored by Bosch Automotive Service Solutions.

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Following The ‘Electronic Trail’ As A Means To Solve PCM-Related Problems

Leave your wrenches in your toolbox because in this month’s Diagnostic Solutions, we’re going to explore how to diagnose many common powertrain control module (PCM)-related driveability and electrical problems by following what I call The Electronic Trail.

GM’s Autronic Eye (1952)

In 1952, GM introduced the Autronic-Eye headlight system that dimmed the high beams when an oncoming vehicle was detected, and then turned them back on when the opposing vehicle passed. The system used a light photosensor mounted in a vacuum tube. The system would then amplify the signal using a tube amplifier so a relay could turn the lights off or on.

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AUDI: Start-Stop System Information

This informational TSB applies to Audi vehicles with a start/stop system. The start/stop system allows automatic engine stops and starts. Although the driver expects it, the engine may not automatically be switched off due to many different factors.