@John_AM19

Remove a single horn ( iow; the 811b ) along with it's driver ( immediately snap a pic with your phone, of the wires connected to the 802-8G driver before disconnecting the wires ).

With the wires removed, measure the DCR ( dc resistance ) of the 802G driver using your multimeter set to measure resistance .

The driver will normally measure @ 6.5 ohms ( +/- .5R ) if it's healthy.