My battery is fully charged but the engine will not crank. I get all of the lights on the dash but engine won't turn at all. It is not clicking so I don't think the starter is the problem. The cables were very corroded so I cut them to get fresh wire and connected a piece that handles multiple cables. I have read there could be a relay problem but can't find the information again and have forgotten which relay. Any ideas would be appreciated. Thank you.