Just got my truck out from the winter and it's starting like *** the relay was gone out of it again replaced that still doesn't even start good plugged it only maybe -4° last night... bad glow plugs maybe before I put it away was starting great in way colder temperatures

 

Is your block heater working?

How long has it been sitting?

What kind of shape are the batteries in?

With it being -4 (is that Fahrenheit?), was the fuel treated?

What kind of oil is in it? How old?

All of these things can affect cold starting.

 

Just seen that the wire wore out on the block heater does that mean it needs a need one or can I just wire new plug on it ? but it used to still start better 2 months ago when I put it away oils 15-40 same stuff that was in it before I put it away and Celsius in from Canada batteries alright

 

-4 Celsius shouldn't be an issue. I've replaced the plug on every 7.3 block heater I've owned! I just get a new plug from the hardware store. They corrode at the plug and eventually loose connection. I would suspect your Glow Plug Relay may not be working, or not working as well as it should. What I like to do when starting in cold weather is let the GP's warm up about another 10 or 20 seconds after the WTS light goes out. Might want to try that and see if that helps. Which brings another question to mind, how long does the WTS light stay on when you first turn the key?

 

Ok good Yeah ill replace it should help and when I bought the truck last year I put a new relay in it worked til I put it away then I was getting no volts so I changed it over I hear the new one clicking and it's getting volts through and it last about 10 seconds or so but I still do leave it for awhile before I turn it over

 

10 seconds sounds like a short time to me, especially if it's the first time starting it when it's that cold out. The GP's will continue to burn for up to about 2 minutes after the WTS light goes out.

 

I leave it for a couple of minutes but still hard start give it pedal for awhile fills the shop full of white smoke

 

Yeah, nothing smells or smokes like a 7.3 on a cold morning!