troubleshooting a horn circuit

Several posts out there on horn circuits...using them and an old service manual I determined the following:

What (I think) I know

1. Both horns are good--jumper wire from battery to each horn

2. Wiring is good--test light lit up when I attached to B terminal connector.

3. Relay is good--horn sounded with jumper wire on the H and B terminals

4. Ground is good--test light lit up when I touched it to the B terminal on the relay

So I think the issue is in the steering wheel contacts. Before I dig into that, I wanted to check with the group to see if i am overlooking the obvious here. Would greatly appreciate you thoughts before I start tearing the steering wheel apart.

Steve