Park the semi truck and the donor vehicle in a safe location, with their parking brakes engaged and engines turned off.
Open the hoods of both vehicles to access the batteries.
Locate the positive (+) and negative (-) terminals on both the semi truck battery and the donor vehicle's battery. The positive terminal is usually marked with a "+" symbol or red color, while the negative terminal is marked with a "-" symbol or black color.
Ensure the jumper cables are in good condition and free from damage or fraying.
Connect one end of the positive (+) jumper cable to the positive (+) terminal of the semi truck battery.
Connect the other end of the positive (+) jumper cable to the positive (+) terminal of the donor vehicle's battery.
Connect one end of the negative (-) jumper cable to the negative (-) terminal of the donor vehicle's battery.
Locate an appropriate grounding point on the semi truck, which could be a metal part away from the battery, fuel system, and electrical components. Connect the other end of the negative (-) jumper cable to this grounding point.
Start the donor vehicle and let it run for a few minutes to charge up the semi truck's battery.
Attempt to start the semi truck. If it still doesn't start, leave both vehicles connected for a longer period to allow further charging of the semi truck's battery.
Once the semi truck starts successfully, remove the jumper cables in the reverse order of connection: negative (-) cable first and then positive (+) cable.
Remember to be careful when handling jumper cables, avoid touching both ends of the cables simultaneously, and follow any additional safety guidelines provided in the vehicle's owner's manuals or by a professional.
It's important to note that attempting to jump start a semi truck can be challenging, and it's recommended to seek professional assistance if you are unsure or uncomfortable doing it yourself.
