Lemmy explains why this basic task always comes before removing the positive cable to help you understand the theory behind the practice.

A practical approach to auto repair shop management.
A brake service job isn’t complete unless the reservoir cap’s diaphragm has been pushed back into place. This simple step is easy to forget, but it helps to reduce brake fluid contamination and ensure proper system function.
Find out how they differ from wet sump oil systems.
Shop Press is the news and idea hub for everything related to working on cars and trucks, focusing on repair, technology, and wrenching lifestyle. With interesting stories from around the world, features on creative people and solutions, and all kinds of other stuff that’ll make you use your mind and your hands.
Auto care news and advice you can use.
Did you know that a modern fuel injection system can fire off multiple sprays in the same time it takes for a spark to jump across a plug?
Step up your repair game with sensible choices.
You can’t sell what you don’t understand.
A fluid transfer pump is the cleanest and easiest way to fill a differential, transmission or transfer case with its necessary fluid.
Formal education teaches you theory and the real world teaches you the rest.
Are you a wrench and a writer? A counterperson and a communicator? A service writer and a scribe? Get paid to share your experience and expertise with thousands of Shop Press readers.
Auto care news and advice you can use.
Four proven ways to run a tighter ship at your shop.
It’s been asked of every new mechanic for more than a century. Does it matter in 2025?
Want to make your vehicle last? Not sure how to talk to a shop about car repairs? Nick and Lemmy offer their five top recommendations.
Once the most basic of circuits, the humble lamp has also progressed.
Ready to grow your shop’s business with fleet maintenance, service and repairs?
Think you know how to pour oil out of a jug? Are you sure about that? Lemmy and Nick talk about the best oil pour techniques to avoid making a mess.
Can independent repair shops benefit by offering mobile service to an increasingly immobile America?
Your multimeter is a versatile tool. But for certain diagnostics, you need an oscilloscope to get a closer look at a vehicle’s electrical systems.