What does the wrench dash light mean 05 ford f350 deisel

Yes, I would say it is the head gasket again. Have the head checked for flat surface once removed to replace the gasket.

I had to make a tool from a flat piece of steel to bolt to the pulley to hold it, so I could loosen the large nut of the clutch fan with a pipe wrench. You can also get a chain strap wrench to use to hold the pulley. There is a actual tool, similar to what I described, but I haven't seen it readily available yet.

yes, diesel is "dirty" compared to gas

I would check you're fuel and return lines.ford sells a kit with all new hosesand fittings

must identified what part of it is leaking has it been changed and wrong or wrongly installed gasket promble

should be a fuse diagram inside of your owners manual if you have one. When you pull the fuse panel door off is there a diagram on the inside of the door of the fuse panel?

fusible link usually orange blk wire to a black round ten on te wire it will be burnt internally ir right after it .

try to clean the valve

How many miles are on the transmission?? It sounds like there is low pressure going to the overdrive clutches or the electronic valve body controller in the transmisssion causing the flashing od light. Pretty typical. The fix would be have the transmission scanned, and it should narrow it down for you.

Have you checked the fuses and dimmer switch? Check the trailers bulbs there is usually one bulb with two filaments for each light, one filament can burn out without causing the other to go. If the bulbs are good you should start at the trailer light connector ( use a test light or voltmeter to test for power at the trucks wire harness first to see if it's the truck or the trailer ) and work your way back to the lights. Clean the contacts on the connector, bulbs and bulb sockets (steel wool and or a can of aerosol electrical contact cleaner).