I am trying to replace a reversing relay , my new switch is different from the old
Switch. The new switch has the numbers 1 and 3 on the top contacts and nothing on the
Bottom. Can anyone tell me what color wires go to whcich contacts.

No, we cannot tell you what wires go where with the information given.

Need to know make and model numbers of each device, and a wiring diagram showing how the old relay is wired, and what the colors are.