Simply, the red positive cable has to be connected to the positive terminal while the negative one (black) to the negative terminal. Reversing the connectivity is dangerous and the common result will be to melt the cables and the terminals. 3. Low quality material. This is another factor that may melt the positive terminal of your car battery. Ford c max battery negative terminal 343872-Jump start ford c max. Positive battery cable needs replacing Ford c max battery negative terminal 343872-jump start ford c max Ford focus mk3 negative battery terminal 2011-2015 dk64 – gala motors. Ford postive and negative battery terminal cables for '02-04 focus svt All seemed to go well. The battery took a full charge and tested out well with my load tester. So I start putting the battery back in the truck. I cleaned up the terminals and connected the positive cable and tightened the terminal. Went I started to attach the negative terminal I got a HUGE spark and bits of molten lead went everywhere!
The I terminal stands for Ignition. The purpose of it to supply 12 volts to the coil during CRANKING the starter bypassing the ignition switch which has a resistance wire running from the switch to the + terminal of the coil. There should NOT be power at the I terminal when the engine is running.
The negative terminal is generally grounded to the chassis, which is why that would work. It's safer to connect it to the chassis because then the spark that may form won't be near the battery. If the battery is giving off hydrogen gas (unlikely, but it can happen), then such a spark could cause a fire or explosion.

First, turn off all lights and electrical accessories in the dead vehicle. Next, connect the cables the same as you would ordinary jumper cables—positive clamp to the positive battery post and negative clamp to a metallic engine component or chassis grounding point. Then try starting the vehicle.

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jump start ford c max battery negative terminal