The larger the wire diameter the better. Purchase one with at least an 8 gage wire. Remember the larger the number the smaller the wire.
For a good all round jump starter that has been getting rave reviews I recommend the Jump & Carry Jump Starter look at the reviews:
Yes, it is possible to jump start a car with a bad starter, but not for very long. The car will eventually die again. It is best to take it to an accredited mechanic and have a professional fix the starter on your car.
Jump the starter solenoid Take jumper wire from Battery + to trigger wire to starter (mounted on top of starter)
Positive jumper to starter, or anyplace along the electrical system. Negative to ground. But whats the big deal about accessing the battery...in the trunk rather than the hood? where is the starter in c230?
Jump the circuit in the keyswitch to the "on" position, jump the starter with a starter button.
Use a pair of pliers or similar tool to jump across the trigger(small) wire and the large cable connected to the starter
Information about jump starter kits can be found online at retailers who sell jump starter kits or review sites that review products for sale in a particular category. Auto Anything is a good place to start for information on jump starter kits.
jump out the solenoid or relay. This will close the circuit for the high current.
Jumper wire from coil + to battery+ Jump starter solenoid - Jump small trigger wire to starter connection
If the starter is bad no. Check battery, starter and solenoid to be sure which is bad.
jump the starter solnoid, if it will crank , turn key on and jump again, if it starts then key switch is ok it would be the starter solnoid that's bad,
The most important consideration when purchasing a jump starter is power. How much power is the jump starter getting to the battery? Many manufacturers only offer battery booster packs that have only 900 peak amps and maybe 200 cranking amps.
The starter relay or solenoid is probably the problem.