9038A Relay Bypass Switch, Relay Tester, Bypass Switch Kit with Amp Loop, 6-Pack, Black

On time products as described

So handy, beats using a jumper wire.

As others have said it’s WIRED WRONG, I didn’t open them up but I suspect the amp loop wire is connected across both switch terminals. This makes the switch non-functional. Based on other reviews I tested all of them with my Fluke multimeter. All of them the switch didn’t disconnect the circuit, Plus the 18 g wire, I realized it’s very under- sized for most high current circuits you would use it on, starter, fuel pump etc but thought it would withstand momentary use. It seems like a bunch of these were made wrong and are sold by several sellers on Amazon

This is a decent set. One did not work. I opened it up and found that the wire inside shorted to the other terminal leaving each switch position as showing zero resistance (continuity). I fixed it and put it back together.

Its a must for the solo mechanics or car tinkers out there... nothing like hooking this up to the starter to start the car from the engine hood bay.

Switch will break internally and waste your time trying to figure out what is wrong with the vehicle.

2 stars is being generous, the wires to measure amperage are very small and I suspect may melt, I'm affraid to even try. I plugged one in and the circuit was powered/activated no matter if switch was on or off. Lesson in " you get what you pay for."

On of switch does not power circuit. It does affect amp readings however, and must be wired incorrectly internally. Go with brand name