Swap factory engine out it had two wired running to the charging system. And replased the engine with b & s 13 horse but it only has one wire running up to the vhrging system. Put a meter on it and it showing no charge. Wat do I need to do .it has a volt gage on the dash.

Hi,
A volt gauge or ammeter? Most are non-contact gauges and use a loop of wire through a piece on the back. You may have an engine with no stator. Easiest way is to give the numbers off the engine.
Peace,
Clarke