I built this this morning and it will make life easier. The connectors are Deans Ultra Plugs and are low resistance. Useful for resistance testing.

I harvested the pins off a climate control valve exchanger but these pins are all over the car so any off junk parts will do. I thought they'd need to be desoldered off the copper but it turns out they are just press fit. I ended up just pulling the copper off.

See attached pics. I already had a deans plug attached to banana plugs for other DIY attachments. Only gotcha with these connectors is to plug it into another connector while soldering, or the connector housing gets hot and the pins move. I'm using 12 awg wire so it gets really hot. It won't fit right afterwards. I've found vice grips work well to hold the connector in place, while "helping hands" hold the wire.

Attached Thumbnails

       

I made some of these too with long leads so I can drive and monitor with my voltmeter. Though mine are not as fancy as yours. I just used some of the bullet connectors from the hardware store. They are very handy for troubleshooting the CIS on my 126.

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Current
1989 300SE - Siegfried
2010 Toyota Tundra Crewmax
2005 Honda CRV

Gone but not forgotten
2001 F150 Supercrew - The Screw
1966 Ford LTD 390 - The Big G!
1995 Mercury sable
1986 Subaru DL
1982 Ford EXP - my first car

I've got an extension that is longer than the car using those same plugs. It's useful for testing brake lights, etc on the back of the car. Large alligator clip attachments go on the battery end of the extension, and a logic probe (or whatever) attachment plugs into the other end.

I'm sure bullet connectors function perfect. These connectors are convenient though because they're designed to be quickly and frequently disconnected from R/C car batteries. And they can take some amperage.