A hydrometer is an instrument used to check the concentration of acid in a battery by measuring the density of the fluid. The higher the concentration of battery acid, the higher the specific gravity. Also use a hydrometer to measure the state of charge of a car battery or deep-cycle batteries in a solar-power system. Check batteries regularly with a hydrometer, as opposed to a voltmeter, to ensure accurate readings.

The batteries in motorcycles, ATVs and other vehicles made by Yamaha are subject to draining just like any vehicle battery. Also like any vehicle battery, they can be charged to breathe new life into their drained cells. Although charging a drained battery will not give you the same results as installing a new battery, sometimes a quick charge is all you need to get your vehicle back on the road.

Wiring a car to operate electric trailer brakes is always advisable, and is a legal necessity in many states if the weight of the trailer and its load is greater than half the weight of the car. Wiring a car to operate trailer brakes requires the installation of an aftermarket brake control, which interprets the car's braking momentum and sends proportionate electrical signals to the trailer, where electromagnets then deploy the brakes. Brake controls are typically sold with a connection harness, so wiring is a straightforward process.

The Pontiac 326-cubic-inch, V-8 engine was first available in 1964, and was designed to replace the 336 when General Motors established an engine size limitation of 330 cubic inches. Eventually, this engine became an option in the Tempest and Firebird models. Its intake manifold is an important engine component, through which the fuel air mixture flows from the carburetor to the cylinder valves. If you have basic auto repair knowledge and the right tools you can replace the manifold at home.

A clean air filter is important to engine performance. It allows air to flow freely to the engine, thus improving gas mileage and increase engine life. An air filter should be changed every 3,000 miles if the vehicle is driven under extreme conditions, or every 30,000 for average driving conditions. Replacing an air filter in a Chevy Avalanche will take the average person 10 minutes or less, even for beginners.