I use either of the following Hella plugs. They plug into a regular cigarette lighter as well as the heavy duty sockets, by just slipping of the yoke on the tip.
PLUGS AND SOCKETS - 2 POLE Part No.
4939
2 Pole Power Socket - Twin DIN Output Description
Twin power socket featuring two DIN 1465 output sockets for connection of accessories. Plugs into standard vehicle cigarette lighter sockets. Primary lighter plug connection features a removable extension piece allowing the unit to also plug into DIN 2 pole sockets if required.
Maximum Load
10A
PLUGS AND SOCKETS - 2 POLE Part No.
4951
2 Pole Cigarette Lighter / DIN Plug - Universal Suits
Sockets to suit 4913, 4915, 4916, 4917, 4918 and 4939.
Maximum Load
8A at 12V
4A at 24V
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