What would make the jumper cables spark and smoke if you just replaced trans in a 85 C-10 no problems yesterday but this morning had power jump it because of cables?

- Incorrect installation of jumper cables: If the jumper cables are not connected properly or if they come into contact with each other, it can create sparks and smoke. Make sure the positive terminal of the donor battery is connected to the positive terminal of the dead battery, and the negative terminal of the donor battery is connected to the negative terminal of the dead battery.

- Damaged terminals: If the battery terminals on either the donor or dead battery are damaged, it can cause sparks and smoke when the jumper cables are connected. Check the terminals for any damage, such as corrosion, cracks, or breaks. Clean or replace the terminals if necessary.

- Faulty jumper cables: Damaged or faulty jumper cables can also cause sparks and smoke when used. Make sure the jumper cables are in good condition and that the connections are tight. Replace the jumper cables if necessary.

- Short circuit: If there is a short circuit in the vehicle's electrical system, it can cause sparks and smoke when the jumper cables are connected. Check the vehicle's electrical system for any signs of damage or short circuits.