Mystery power port

[Kevinf]

I saw these ports in the box of an older ambulance. I'm wondering what they are intended to connect to? They'd be where you'd expect to find standard 12v automotive ports (cigarette lighter outlets) in the box.

 

[NPO]

I saw these ports in the box of an older ambulance. I'm wondering what they are intended to connect to? They'd be where you'd expect to find standard 12v automotive ports (cigarette lighter outlets) in the box.

View attachment 3693

http://helpful.knobs-dials.com/index.php/Common_plugs_and_connectors#3-Pin_and_4-Pin_DC_Plugs

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[NomadicMedic]

We had one like that for our old suction.

 

[res1551cue]

Hardwired ports for Zoll monitors.