WHO HAS AN ANSWER?

[depedl89]

I am going to test everything but maybe someone can save me some time. on a cold start I turn the key on and the glo-plug timer does not kick on and the truck does not start. After plugging into the block heater for a while, you can here the glo-plug timer turn on and the truck starts normal for the rest of the day. outside temp. does not matter, it does this every cold start.

[Dave]

Do you see the WTS light on the dash when you dont plug it in?

How old are your batteries

[depedl89]

Yes the light comes on. The batteries are 6 months old. I hooked up both batteries on a cold start and still the same results. truck will only cold start after black heater has been plugged in.

[superjet701k]

passenger side battery, has the power lead to the glow plug controller ive seen them break off, rub threw, and short out check it out is like a 6awg wire red. then use a test light or meter and make sure the controller is getting power. if i rem correctly your eot sensor tells the controller when its time to turn on

[depedl89]

you r right. I have since found that the glo-plug system consists of the EOT sensor, the BPS sensor, the module, and glo-plugs... Before I buy anything I am going to test the module to see if power is coming in and going out on cold start.

[russf]

I took an advanced 6.0L class and according to the manual we recieved it says "if wait to start light does not come on, or cannot connect to vehicle with scan tool the pcm is powering up." I would personally look at the GPCM and maybe first check fuse #22 under the dash it will be a 20amp make sure its good.