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No you do not have to unhook the battery. Althuogh you should do so anytime you perform any work on a vehicle.
Behind the Battery in a small pouch.
Battery to a large terminal Starter to other large terminal Trigger wire to small terminal (if you have an extra small terminal on new relay disregard)
It is under the hood on the right (as you face the car with the hood open) near the front. The battery terminal posts are actually pointed towards the interior of the car and not up.
One large terminal post to battery Other large terminal post to starter Small terminal post to trigger wire If extra small terminal post disregard
Battery connect to large terminal Starter connect to other large terminal Trigger wire (smaller) connects to small terminal If you have an extra small terminal disregard
A battery terminal or a battery CABLE terminal. If the terminal is gone or destroyed on the battery, you need a new battery. If the cable terminal is terminal, you can buy an after market replacement or a complete new cable with terminal at most any auto parts store.
The negative terminal of a battery has a - sign and positive terminal has a + sign.
Start by locating the Positive terminal (usually the red one)... Disconnect it from the battery. Then do the same for the Negative terminal (the black one). Then there may be a small hex head bolt at the bottom the the battery, check for it and remove it, the battery should come right out.
You connect the batteries in series Red charger lead to one red battery terminal, then the black battery terminal of that battery to the red battery terminal of the second battery. Then black battery terminal of the second battery to the black lead of the charger.
If you can get to the starter, you hook up one side of the switch to the terminal that goes to the battery and the other side of the switch to the small terminal marked with and "S". "S" is for starter. The other small terminal you leave alone. Applying power to this terminal will damage the starter.
The top of a battery is called a carbon rod, which is on the positive terminal.