I have a 97 Class B 3500 Motorhome and the battery went bad, I replaced it with a new one and when I connected the fuse link [I guess] to the positive post, It sparks bad, but when i put it on the first time and started the engine, it would make and break every minute or so, it hooks to a relay mounted right above the battery and the wires route under the firewall to I don't know ! I disconnected the wire and left it un connected, and it starts and runs ! any help would be appreciated ! There is also a battery in the back of the van ! Coming from this relay is two red wires, one a little bigger than the other ! Thanks in advance !