It can be said that no book or manual about do-it yourself auto repairs is fully complete without a section that concerns auto repair safety. Yet interestingly enough few budding or even experienced auto mechanics it seems pay serious attention to safety and basic safety procedures.
While it is true that vehicles are more trouble free, requiring less maintenance, and with more electronic and automated systems today does not mean “no maintenance” ever. Auto dealership service departments still do a roaring business. Even though some avid auto owners may insist that their cars, trucks or SUVs never ever “break down” , Toyota and other Japanese auto dealership service departments are still in business with plenty of repairs on hand, and a long queue if you wish to book your automobile for service.
Next never crawl under a car or vehicle that is not adequately supported. Next in line never ever rely on the auto jack alone to hold up the car, truck, van or bus that you or your team are working on. No excuses will ever do for this cardinal and very deadly sin of omission and laziness. The vehicle should be on level ground with the transmission in gear (manual transmission) or park (automatic tranny). Next the emergency brake should also be fully engaged. One or preferably more wheels should be solidly and firmly blocked. To block a car from rolling a brick or a piece of wood can be utilized to prevent the car from rolling.
It is a simple rule and basic safety prevention rule and standard never to smoke cigarettes or tobacco products when working on the fuel system or battery charging system. Gasoline vapors from the fuel tank, fuel lines, carburetor or fuel injections are more than extremely flammable. Hydrogen gas inside the battery, as well as lingering about the battery case, is dangerously explosive. The hydrogen sulfide gas emitted by charging (as opposed to dead) auto batteries can be set off by any or even the smallest spark. Once set ablaze the hydrogen sulfide gas can serve to explode the battery with its dangerous caustic battery acid- which can splash not only on your mechanics set of clothes but also onto their face, eyes or skin. Thus make it a solid rule to refrain from smoking any time that you are working on a car or under the hood.
Lastly when doing any kind of electrical work such as replacing a starter, ignition switch, alternator, voltage regulator, radio etc, it is always a wise and safe idea and practice to disconnect the battery ground cable entirely. This will eliminate the possibility and possibilities of accidentally grounding the electrical circuit which could well start a fire or alternatively damaging some component in the now very delicate electrical and electronic systems of modern cars. The component of modern hybrid vehicles even come now in shielding electrostatic bags alone just to shield the sensitive electronic components of these hybrid gas / electric vehicles from the ravages of simple static electricity