Here's a very detailed heater troubleshooting guide Ram Diesel Manifold Heater Problems
If the light is flashing but the grids aren't coming on you have a very unusual problem.
Does the voltmeter dip and climb in time with the light?
my truck does exactly the same thing--my colt guage doesn;t spike too much (like normal i guess)--this weekend i tested the relays and they are working fine going to the grid heater, so i don;t know--tomorrow i will go through the heating problems guidline that you posted and see what i come up with--if you figure yours out, please let us know what's up--thanks aj
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