Dimming expansion issue

[troylong45]

Idk If channel 4 worked or not befor a diy jabeo harness but I set jumpers to 5v anolog and only seeing 0.53 volts at 100% undid jumpers and maybe got 0.56v not sure might been the same. I did have a backwards wire on the pump side of the harness the ground and 5v signal was swapped or maybe while testing with multi meter could have shorted the probe across 2 of 3 wires not 100%sure.

What can I test on the expansion board to see if I popped something?

[Sacohen]

It's been a while since I did anything with my Jeabo pumps, but I'm pretty sure they are 0-10v not 0-5v.

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[troylong45]

I seen so things that says 0-5v will work on 0-10v they say but can't exceed 5v. So they put voltage divider circuit in the harness. But it's the expansion itself I probed the breakouts and everything works as it should expect channel 4