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Auto Techs	Tech Q&A	Collision Techs	Webinars

July 5, 2012


Community	Products	News	Survey

IN THIS ISSUE
• Spotting worn hub bearings
• We want to know
• Battery cable repair tip
• Battery tips

Spotting worn hub bearings
Signs of a worn wheel hub bearing vary in severity. Some may be difficult to detect, leading to damage before corrective action can be taken. The time frame in which damage occurs is linked to driving conditions and/or the mechanical practices that were followed at installation. Noise is a classic sign of a bad wheel bearing or wheel hub bearing. Here are some indicators of worn wheel hub bearing or other wheel-end damage.
» MORE ON: More tips from Timken

In The Shop

We want to know!
Ever notice what the line below the magazine's name says? It reads, "advancing the automotive service professional", and it's not just a tag line. It's something we take very seriously at Motor Age. To make sure we stay on track, we'd like to ask that you take a few minutes and complete this short survey.
» MORE ON: Join our online community before July 13 for the chance to win an iPad!

The right way to repair a battery connection
Richard McCuistian
The connection between the battery post and the terminal is prone to give trouble anyway, and using the wrong kind of replacement battery terminal can create a bevy of new problems in the form of additional connection points. This is the way I teach my students to replace battery terminals, especially when a replacement cable is too costly to buy and too much trouble to route and replace. See the procedure here
» MORE ON: Join Richard in the AutoPro Workshop!

Battery tips
Batteries have been in use for over 100 years, and testing them is a skill that every technician should have. This edition of The Trainer covers battery testing, as well as uncovering problems in the starting and charging systems. Watch the full video here
» MORE ON: Check out our complete "Trainer" library here

Special Categories

Community

Products

News

The July "Question of the Month" revisits one of our June features on an electrical testing technique called "voltage drop". Measuring voltage drop is a dynamic test performed on a 'live' circuit and is an excellent way to find the cause of unwanted resistance that static ohm measurements might miss. Let's see how comfortable you are with this form of testing!

Technician A is performing a voltage drop test on a horn circuit. He's placed his negative voltmeter lead on the negative battery post, and his positive voltmeter lead is placed on the ground terminal of the horn connection right at the back of the horn assembly. With the horn pad depressed and the horn circuit activated, he measures 12.40 volts at the ground side connector. This tells Technician A that the (choose the correct response):

The power side of the circuit is "open".
The ground side of the circuit is "open".
The horn has an internal "open".
The horn is working properly.

Take the test, then see how you compare to techs from around the country. Don't forget to click on the answer link for a PDF explanation or to register for the free prize drawing from our partner, Federated Auto Parts!

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