I have a '94 Mercedes C280 and it seems to have a problem where the turn signals, the rear window defroster, & the intermittent windshield wiper (but not constant & fast constant speeds) will go out & stop working. They sometimes come in & out while I'm driving & will work for 5 minutes then stop working again for a while. Does anyone know of a way to fix this? I assume maybe they are all connected together through the same relay or something of the sort? Any ideas on a fix? Thank you in advance for any replies!