So I can't seem to get anything of J1587 in any Mack with a 6-pin diagnostic connector (most of the trucks I have to work with are 96-02 CH613s with E7s). There is a 5th pin that I don't see in any brands with cat or cummins engines so I'm wondering if any of you guys knows what it does, or what you have to do in order to get the J1587 link to work in a Mack. I see that you can buy a special cable for about $200 nexiq but I don't really want to buy if its as simply as connecting the 5th pin to power, ground or a resistor you know?
