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Hoping someone can help give an idea what's up with an issue I have with my 2005 300C.

Randomly while driving, the dash cluster shuts off - in addition the AC fan shuts off - very briefly for 1-2 seconds - then all comes back on (with all lights on dash flashing on as it comes back to life).

While this happens, the car continues to drive fine.

I have a brand new battery. The issue has been going on for several months. It's random, sometimes it doesn't do it at all, sometimes it's happens constantly while driving.

It seems like something is loose - either a harness connection or perhaps a circuit board on the dash cluster has issues.

Anyone heard of this or any ideas on how to troubleshoot?
 

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Intermittent electrical problems are extremely difficult to track down.

I suspect a loose connection somewhere. My suggestion would be to check the main PCM harness connection, the auxiliary battery post connection next to the front fusebox, the primary power and ground connections at the starter and the main harness connection to the firewall.
 
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