I have a 1985 f150 with a 351, its my first truck/project. But recently I have run into a problem with the Indicators and heat and blower fan. In the morning when the truck is cold the turning signals and heat blower fan will cut out. They will both function fine when the engine is off and ignition is on but as soon as fire the engine they both cut out. I use to be able to warm it up and shut it off then on again and they would both come back on. But now they wont come on till mid day when the temp goes up a little. This problem only occurs when the engine is running. Thanks