Step 2: Attach the red clamp of the jumper cables to the positive (has a red cover on the terminal post) of the dead battery. Both vehicles should be in park (for automatic transmissions) or neutral (for manual transmissions). Turn off the engine in the running vehicle and put on the parking brake. All other electronics, including lights, stereo, and windshield wipers, should be turned off. Step 1: Turn on the heaters inside both vehicles. You’ll need a second vehicle running and jumper cables. Jump-Starting a Diesel Truck with Two Batteriesĭon’t have time to wait for your batteries to charge? You’ll need to jump-start your car batteries. The negative (black) wire should be the last on. Step 5: Reinstall your battery terminals starting with the positive cables first. If your truck still won’t charge, reattach the chargers with the above steps and charge for another hour. Step 4: After charging for two hours, turn off the battery chargers and try to start your truck. Although the charging will take longer, you’ll get a more complete charge. Step 3: Adjust the charger settings to low amperage. Repeat this process on the second battery using your second charger. Then attach the charger’s negative (black) clamp to the negative terminal. Step 2: Connect one of the charger’s positive clamps (red) to the positive terminal of a battery. Repeat the process with the other battery. Step 1: Disconnect the negative terminal on one battery, then disconnect the battery’s positive terminal.
If you use a battery charger, you’ll need two chargers: one for each battery. Once your truck is started you should drive around for 30 minutes so the alternator can fully recharge the batteries. When your batteries die, you can charge them with a battery charger or jump-start them with another vehicle using jumper cables. Image courtesy and copyright of Charging a Diesel Truck with Two Batteries
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