Pulsing headlights and dash lights

X2. The VR is bolted to the firewall and picks up it's ground signal from the green wire that typically has a ring terminal on the end. The bolt that fastens the terminal and the VR tab to the firewall can get rusty and corroded behind the bolt head/VR tabs and cause all kinds of problems. Start by cleaning all the connections, sanding the metal surfaces where the connections are made, use some dielectric grease to preserve your cleaning and just looking the system over for anything else that could be problems. A new VR as mentioned by RF will not break you so if cleaning/torquing doesn't work then start there.

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