Start with your husband checking the tail lights to see if there are any broken or shorted wires. Remove the tail light bulbs and check the bulb sockets. sometimes the wires get corroded and can short out, The tail lights and the dash lights are on the same fuse.
Check out the guide below on using a volt meter
https://www.2carpros.com/articles/how-to-use-a-voltmeter
Wiring diagram is attached below
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Wednesday, June 2nd, 2021 AT 1:51 PM