[DieselDoctor]

One of the changes I'm making during the resto is to delete the original glow plug indicator and upgrade to a key switched solenoid for the glow plug circuit. I wanted to keep the look of the original indicator, but modify it with a low amperage draw LED lamp as an indicator when the solenoid is energized. Here's my solution. Picture #1 show a NOS glow plug indicator and a single LED marker lamp used on modern tractor trailer trucks. Picture #2 shows the original indicator with the resistor removed. Picture #3 is of the LED positioned in the frame of the original indicator housing and bedded with RTV silicone to hold it in place. The LED lamp only needed a bit of reducing it's upper diameter to allow it to slide into the housing. Picture #4 is of the lamp lit, nice and bright so it can even be seen in direct sunlight. The LED is also available in red, but I chose the yellow as red lights make me think of a warning lamp. This is a great alternative and only draws about 1/5 amp when lit.