There is a lot of places, Just choose one that is more convenient.
Just make sure that there is a direct connection to the block and not the wrong side of an engine mount. These are made of rubber and isolate the block electrically as well as mechanically.
The idea really, is to get most power to the starter motor. The motor is bolted directly to the block, without insulating gaskets.
Remove the spark plug wire from the spark plug. Use some heavy gloves or a set of insulated pliers to hold the spark plug wire about 1/4-inch from the engine block (ground) and crank the engine - you should see a spark jump from the wire to the engine ground. For a better check, use another spark plug and put it on the spark plug wire and use it as a "jumper" from the wire to the engine ground.
The battery ground wire runs from the battery to the engine block.
the hot wire goes to the starter and the ground wire bolts to the engine block.
The ground wire leads from the negative side of the battery and connects either to the engine block or to the frame of the automobile.
A jumper wire should use to bridge electrical ground across?
It is located on the battery
Some older wire does not have a ground. All you can do in that case is use a jumper wire to connect the ground to the neutral.
A jumper wire can be used to bridge electrical ground crossings when there is a break in the ground path, leading to unreliable or no connection. By connecting the ground terminals on either side of the break using a jumper wire, you can establish a reliable ground connection and ensure proper functioning of the electrical circuit. It is important to use proper gauge wire and ensure proper insulation to prevent any electrical hazards.
if it is a big power wire ( same size as the battery cable ) then it is the earth wire you should find that the battery has one wire going directly on to the engine or chassis there are different arangements the negative wire could be coming directly to the starter and if this is the case then the wire is just earthing the engine but in a lot of cases the starter is getting its ground from the engine and the engine gets its ground from the battery
Connect a ground wire to what? If you mean from the engine block to the firewall or frame - it ia always recommended that a grounding strap be connected between the two.
that would be the negative normally in most cars goes to ground on the engine block
There are several ground wires - if you have a specific one in mind, please state which one it is. Some examples include the battery negative to ground (usually the chassis) and the engine block to ground.