another wth is this part question

there are 2 blocks that were connected to the charging circuit in my 76 dart swinger 318. all i can see is 3 sets of numbers:

first row looks to be 344 or 844
second row: 387 4600

there are 2 of these each has a 3 pin connection.the back of each looks like a small computer motherboard - i know that is a terrible description but all i can think of.

anyone tell me what these are? i searched for the part numbers online but no luck.
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