93 d250 grid heater not working.
 

Have a93 cummins in the shop and the grid heaters and the alternator is not working I wired up a external regulator for the charging system. it has a new pcm and crank sensor per the customers request.

Update found info center where the wait to start lamp is the pin was broke off installed a temporary pin now the wait to start light never shuts off and the grid heaters never come on
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Editing since I'm to dumb to read a full post before responding.

You may get a better response from here. http://www.dieseltruckresource.com/f...all-topics-93/