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.
You should also hear something from the driver when connecting the multimeter. It may be quite faint. But something akin to a light click.
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