How to Jump Start a Car: A Complete Guide for Canadian Drivers
A dead battery can happen to anyone at any time, but it happens far more often when temperatures drop below minus 10. Cold weather reduces your battery's cranking power, and a battery that worked fine in October can leave you stranded in a parking lot by January. The good news is that boosting a car is a straightforward process if you follow the right steps in the right order.
What You Need Before You Start
A set of jumper cables. These are two long cables with red and black clamps on each end. Red is positive. Black is negative. Buy a set that is at least 10 to 12 feet long so you have enough reach between vehicles. Keep them in your trunk year round.
A second vehicle with a working battery. The donor vehicle needs to have a fully charged battery with the same voltage as yours. Almost all passenger vehicles use 12 volt batteries, so this is rarely an issue.
OR a portable jump starter. These compact battery packs have become popular in recent years and they work extremely well. A good lithium ion jump starter fits in your glove box, holds a charge for months, and lets you boost your own car without needing a second vehicle. If you drive in Canadian winters, this is one of the best investments you can make.
Before You Connect Anything: Safety First
Inspect the dead battery. Look at the battery casing for cracks, leaks, swelling, or any visible damage. If the battery looks physically damaged, do not attempt to jump start it. A damaged battery can leak acid or in rare cases explode. Call a professional instead.
Check for corrosion. Look at the battery terminals for a white or greenish crusty buildup. This corrosion can prevent a good connection with the clamps. If you see it, brush it off with a cloth or dry toothbrush. Do not touch the corrosion with your bare hands.
Turn everything off. In both vehicles, turn off the ignition, the headlights, the radio, the climate control, and any accessories. You want zero electrical draw when you make the connections.
How to Jump Start a Car with Jumper Cables
Follow these steps in this exact order. The order matters because connecting cables incorrectly can cause sparks, damage your vehicle's electronics, or injure you.
Step 1: Position the vehicles
Park the working vehicle close to the dead vehicle so the jumper cables can reach both batteries comfortably. The vehicles can be nose to nose or side by side, but they must not be touching each other. Engage the parking brake on both vehicles.
Step 2: Open both hoods and locate both batteries
Most batteries are under the hood, but some vehicles have them in the trunk or under the rear seat. Find the positive terminal (+) and the negative terminal (-) on each battery. The positive terminal usually has a red plastic cover or a red marking.
Step 3: Connect the red cable to the dead battery
Take one of the red clamps and attach it firmly to the positive terminal (+) on the dead battery. Make sure the metal jaws grip the post tightly. A loose connection will not work.
Step 4: Connect the other red cable to the good battery
Take the red clamp on the other end of the same cable and attach it to the positive terminal (+) on the working battery.
Step 5: Connect the black cable to the good battery
Take one of the black clamps and attach it to the negative terminal (-) on the working battery.
Step 6: Ground the other black cable
This is the step most people get wrong. Do not connect the last black clamp to the negative terminal of the dead battery. Instead, find an unpainted metal surface on the engine block of the dead vehicle. A bolt or bracket will work. This acts as a ground point and keeps sparks away from the battery and the hydrogen gas it produces.
Step 7: Start the working vehicle
Start the donor vehicle and let it run for 3 to 5 minutes. This allows charge to flow through the cables to the dead battery.
Step 8: Start the dead vehicle
Turn the key or press the start button on the vehicle with the dead battery. If it does not start on the first try, wait another 2 to 3 minutes and try again. Do not crank the starter for more than 10 seconds at a time.
Step 9: Disconnect the cables in reverse order
Once the dead vehicle is running, remove the cables in reverse. Make sure the clamps do not touch each other or any metal surfaces while disconnecting.
Step 10: Drive for at least 20 minutes
Drive the vehicle at normal speeds for at least 20 to 30 minutes. This allows the alternator to recharge the battery. Do not just idle in the driveway. If you turn the car off too soon, the battery may not have enough charge to start again.
The Connection Order: Quick Reference
Save this page on your phone or take a screenshot. This is the part people forget when they are standing in a cold parking lot.
Connecting
Disconnecting (reverse)
How to Use a Portable Jump Starter
A portable jump starter is simpler and safer because there is no second vehicle involved.
1. Make sure the jump starter is charged.
2. Turn off your vehicle and all accessories.
3. Connect the red clamp to the positive terminal (+) on your dead battery.
4. Connect the black clamp to unpainted metal on your engine block.
5. Turn on the jump starter.
6. Start your vehicle.
7. Disconnect the black clamp first, then the red clamp.
8. Drive for at least 20 minutes to recharge the battery.
Portable jump starters are especially useful in Canada because you do not need to find another driver willing to help. If you break down on a quiet road outside Ottawa at 11 PM in January, a jump starter in your glove box is worth its weight in gold.
What to Do If the Jump Start Does Not Work
Check the connections. Make sure every clamp is firmly attached to the correct terminal. A weak connection is the most common reason a jump fails.
Wait longer. If the battery is severely discharged, it may need 10 to 15 minutes of charging before it has enough power to crank the engine.
Check for corrosion. Corrosion on the terminals can block electricity even when the clamps are on tight. Clean them and try again.
The battery may be completely dead. If a battery has been drained too many times or has reached the end of its lifespan, no amount of boosting will bring it back. It needs to be replaced. Ontario Towing carries replacement batteries and can swap yours on the spot. Call (613) 619-4545.
It may not be the battery. A single click when you turn the key usually means a starter motor issue. If the engine cranks but does not fire, it is likely a fuel or ignition problem. In either case, you need a tow, not a jump. Call us for roadside assistance.
Why Batteries Die More Often in Canadian Winters
Cold temperatures slow down the chemical reaction inside a battery that produces electricity. At minus 20, a fully charged battery loses about 50 percent of its cranking power. At the same time, cold engines need more power to start because the oil is thicker and the components are stiffer. So the battery is producing less power at the exact moment the engine demands more of it.
If your battery is more than three years old, have it tested before winter arrives. Most auto parts stores will test it for free. A $200 battery replacement in October is far cheaper than an emergency jump start on the side of the Queensway in February.
Signs Your Battery is About to Die
Slow cranking: the engine turns over more slowly than usual. It sounds sluggish and laboured.
Dim headlights: noticeably dimmer than they used to be, especially at idle.
Electrical issues: power windows move slowly, radio cuts out, dashboard lights flicker.
Battery warning light: if this light appears on your dashboard, have your battery and charging system tested immediately.
Age: most car batteries last 3 to 5 years in Canada. If yours is in that range and showing symptoms, replace it before you get stranded.
Common Mistakes When Boosting a Car
Connecting the black cable to the dead battery's negative terminal. Always ground the last black clamp to bare metal on the engine block. Connecting directly to the battery can create a spark near hydrogen gas.
Mixing up positive and negative. Reversing the polarity can cause a short circuit, blow fuses, or damage the engine computer. Red is positive. Black is negative. Double check before you clamp.
Letting the clamps touch each other. While connected to a battery, red and black clamps touching will create a short circuit and sparks.
Trying to jump a damaged battery. Cracked, leaking, frozen, or swollen batteries should never be jumped. Call a professional.
Turning the car off too soon. You need at least 20 minutes of driving to recharge. Shutting off after 5 minutes means the battery will likely be dead again.
When to Skip the Jump and Call for Help
Jump starting is safe in most situations, but sometimes calling a professional is the smarter move.
You do not have cables or a jump starter. Do not improvise. Call for help.
The battery is physically damaged. Call Ontario Towing and we will bring a replacement to your location.
You are in an unsafe location. Busy highways, narrow shoulders, and poorly lit areas at night. Your safety matters more than getting the car started. Call for roadside assistance and wait somewhere safe.
You are not sure what you are doing. No shame in calling for help. A professional jump start costs far less than repairing electrical damage from incorrectly connected cables.
The car needs jumping every few days. Repeated dead batteries point to a failing alternator, a parasitic drain, or another electrical issue. You need a mechanic, not another jump.
Frequently Asked Questions
Yes, if you have a portable jump starter. These battery packs let you boost your own vehicle without a second car. If you only have jumper cables, you will need a second vehicle with a working battery.
Drive the vehicle for at least 20 to 30 minutes after a successful jump. This gives the alternator enough time to recharge the battery. Idling is not as effective as driving at normal speeds.
If done correctly, jump starting will not damage your vehicle. However, connecting the cables in the wrong order or to the wrong terminals can cause electrical damage, blown fuses, or damage to the engine computer. Always follow the correct connection order.
If a single jump gets you going and the battery holds its charge afterward, the battery is probably fine. If the battery dies again within a day or two, or needs to be jumped repeatedly, it likely needs to be replaced. Batteries older than 3 to 5 years in Canada are living on borrowed time.
Cold temperatures reduce the chemical reaction inside the battery that produces electricity. At minus 20, a battery can lose up to 50 percent of its cranking power. At the same time, cold engines need more power to start. This combination is why dead batteries are so common during Canadian winters.
Yes. The voltage involved (12 volts) is not dangerous in wet conditions. Just make sure the clamps are securely attached and keep the cable connections as dry as possible.
The cost depends on the time of day and your location. Ontario Towing provides 24/7 jump start service across Ottawa with fair and transparent pricing. Call (613) 619-4545 for a quote.
Need a jump start right now? Ontario Towing provides 24/7 jump start and battery replacement service across Ottawa and the National Capital Region. Call (613) 619-4545 any time, day or night.