Never start a modern car without checking these things first – Jalopnik

Do you remember the days when you didn’t have to think about what to do when your car battery died? You just pulled out your trusty jumper cables and took care of it. With modern cars, things are no longer that simple. Today’s vehicles have a lot of complex electronics, not only in the dashboard, but also under the hood. These electronics can be damaged during a jump start between two cars.

There’s also the battery placement and whether you should even use it on a jump start. Many car companies have removed the battery from the engine compartment and want you to use external connection points instead of the battery itself when performing a jump start. Hybrids and EVs are completely monsters in their own right, with their own rules about jump-starting (some manufacturers even ban their use to jump-start another vehicle). And then there’s the question of whether the donor car should be running while it prepares for a flying start.

All of this can of course be resolved by consulting the owner’s manuals of both cars involved in a possible jump start. The manual will tell you if your car should be used as a jump start. If there are special requirements, such as using external terminals instead of the battery, the manual should tell you that too. Either way, you may want to check out our guide on how to determine whether you need a jumper cable or a new battery.

Why? Actually, this battery hiding game has a number of purposes. First, while the trunk is not always cool, especially in summer, it is much cooler than the engine compartment when the car has been running. Storing the battery in the trunk prevents it from overheating. The other reason has to do with weight. A lot of weight is placed under the hood. Sending the battery to the rear makes this more even. Do we like it? No. But those are the reasons why some car companies do it that way.

So, how do you start such a car? Instead of the battery being under the hood, there are usually terminals where you can connect the cables. If your car is equipped with this, use it instead of the battery when jump starting, even if the car’s battery is under the hood. This helps protect the car’s computers from malfunctioning. Some manufacturers have connected a battery status monitor to the negative terminal of the battery. A direct connection to the battery can therefore disrupt a correct measurement.

Have things changed for modern cars? Not that we can find. Pretty much every guide we found pretty much recommends starting cars in that order. Some even took the step of revving the engine of the donor vehicle. But not all cars are the same, so it’s important to consult your owner’s manual to determine if your car needs to be jump-started.

One thing that was emphasized in the manuals we found was the order in which the cables are connected. Generally, you start by connecting one of the red cables to the positive terminal of the dead battery. Then connect the other red cable to the positive terminal of the donor battery. Then connect one of the black cables to the negative terminal of the donor battery. Finally, ground the other black cable to an unpainted metal surface of the donor vehicle, away from the battery.

However, please contact your manufacturer first. Come on states bluntly, “Do not start another vehicle with your hybrid vehicle. Starting another vehicle will damage the hybrid vehicle’s 12 volt battery.” Therefore, read your owner’s manual.

What about an EV? Again, check with the manufacturer to find out if you can use it to jump into another vehicle or if the 12-volt battery can be jumped. Tesla says in the Model 3 manual: “Model 3 cannot be used to start another vehicle. Damage may result.” So there you go. And you should never use an EV to jump-start another EV.

They work just like jumper cables, but without the second car. You simply connect the red cable to the positive battery terminal and the black to the negative terminal, then start your engine, which you should be able to do almost immediately. Quickly disconnect the cables and run your car for a few minutes to allow the alternator to fully charge the battery. The booster itself is rechargeable and we were able to make several jumps before needing to recharge ours.

There are even more reasons to take this box with you. What if your battery runs out and no one else is around? Sometimes your car’s battery dies when you are parked in a place that is difficult for another car to reach. Plus, it’s nice to know that you have the independence of not having to rely on help from strangers when your battery runs out.

Jumper cables allow the power to flow freely, leaving both cars vulnerable to a power surge, which can cause several problems. Some have reported that these spikes cause damage to a car’s traction control system, power steering, airbag system, and start/stop system. There is also the possibility that your warranty will be void if you perform a jump start incorrectly. And of course we mentioned how some cars connect a battery monitoring system to the 12 volt battery, which can disrupt a jump start.

There are two important lessons from all this. The first is that you should always consult your car’s owner’s manual before performing a jump start on any modern vehicle. Second, spend a few dollars on a portable jump starter and carry it with you in your car. That should address most of the concerns we mention here. It may not be as easy as it used to be, but a jump start is still doable in most cases.