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PS2 Dual Smoke Units

My older Triplex 30-1337-1 has a PS2 board in it. I think it's a 3V I think because it has two AA batteries instead of a 9v. It also only has one smoke unit. I looked up the manual for a PS2 upgrade kit and it says the smoke units tie in to a 4 pin connector on the board. I haven't physically located it on the board yet. I had the tender apart for other reasons. 

Can I wire up a second smoke unit for the tender in parallel with the boiler smoke unit? I'm electrically challenged but I think parallel will keep my voltage the same. I just don't know if I should worry about that or worry about current more. Should I wire in series if the current is more of a concern?

I was considering MTH AA-2100002 as the unit for the tender. It's smaller and should fit very easily. 

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OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

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