I have a '74 Mercury 1500 that really has alot of trouble cold starting unless I jump start it. (with one of those portable jumper things) The battery is new and has I think 540 cranking amps. I'm thinking I might need to replace the battery cables, they look pretty old and I think the gauge might be too small for their length. To test this I would like to hook some jumper cables directly to the starter and see if it starts faster. Would this be a bad idea for any reason?