Changed battery terminal connectors

Hello,

Fuses blow because there is a short to ground on the circuit[s] that the fuse is protecting. This happens because of Ohm's Law, the laws that govern electricity. One of Ohm's laws states that if one of the three properties of electricity is constant[Voltage - Voltage remains constant in an automotive electrical circuit(battery voltage 12V)] and one of the last two properties goes down[Resistance - resistance goes to zero as there is direct path back to the negative battery terminal] then the last property must go up proportionally[Amperage - amperage goes to battery amperage]. The amperage rating of the fuse is overcome and "pop" the fuse melts, or blows, and there is an open in the circuit, protecting it, just like it was designed to. I am guessing that even though the terminals were installed correctly, that there is an internal short in the battery, and it is no good. I would recommend replacing the battery and then the two fuses and report back with how everything turns out.

Thanks,
Alex
2CarPros

Be aware too that fuses often blow when reconnecting the battery due to the current surge when computers' memory circuits charge up. This is especially likely when two or more blow at the same time, and they were okay before the battery service. Fuse link wires are used for their slow-blow characteristic, so don't expect to see any of them burned open.

By your description of the current problem, this is real common on all car brands when the smaller positive battery wire going to the under-hood fuse box has a loose or dirty connection. That's the blue arrow in the diagram. Check that first. That can also be confirmed by using a test light to check for 12 volts on any of the fuses. The cheap test light with an incandescent bulb inside is the most accurate tool for this because it needs to be able to draw current to work. Digital voltmeters draw very little current, so they can give a false reading with this type of problem.