help! lights pulsate and wipers speed up

I had a similar pulsing and I changed the reg the alt and bypassed the amp gauge still nothing finally when I tore out my harness to do a wire kit I found that two wires were just slightly melted together on the interior side of the bulkhead connector .I cant remember exactly which 2 it was off hand but I still have the harness in the shop and will check tomorrow if you need