I would advise a great place to start would be to check all of the ground connections.
Make sure from the battery that all connections are clean and tight.
Another thing would be to get someone to watch the gauges/lights/radio while you move the wiring, under the dash, around the fuse block, all harness wiring etc. That you can access.
You are looking to locate something that causes the fault to occur so you can narrow down the potential cause.
A loose connection, pinched wiring or a corroded/bad ground are your most likely causes.
Hope that helps.
Any further questions please do not hesitate to ask.
Thursday, July 8th, 2021 AT 10:26 AM