Quote:

The headlights are setup on a relay.



With what you are describing, you must have the relay powered from the battery side which will work but it will "trick" your ammeter into showing a charge when the headlights are on when there could be really no charging (breaking even from alternator) or even a discharge (from battery).

A better solution would be to take the power from the alternator stud or at least from that side of the ammeter. In that case, when your headlight relays are pulling juice, it will keep the ammeter honest so it won't be as confusing. What's worse, if this is the case, you are pulling that load through the ammeter whenever your headlights are on which is not the best idea with the well-known Mopar wiring (or lack thereof).

To get around this, move the relays to the alternator side of the charging circuit and/or do the ammeter bypass.