Rick's Free Auto Repair Advice

Backprobe an electrical connector

How to backprobe an electrical connector

Two ways to backprobe

When you’re checking live voltage readings on sensors, the challenge is How to backprobe an electrical connector. image of piercing backprobe from FlukeSome pros stick a pin through the wire. That works, but you must make sure you seal the insulation when you’re done. If you don’t, the pierced insulation will allow corrosion to set in.

Buy piercing probes

But these piercing claws from Ferret make the job much easier.

Isolate the wire carrying the signal you want to monitor. Then position the wire in the cradle of the “claw.” Screw the piercing probe into the wire and then attach the lead from your digital multi-meter into the end of the Ferret Claw. It gives perfect readings every time. When you finish the job, apply a dab of finger nail polish to seal the puncture hole. Do NOT use RTV. It causes corrosion on copper wires.

image showing backprobe pierced through wire

Buy spoon backprobes

A spoon backprobe slides down the side of the insulation and into the electrical connector. As it slides in, it displaces the silicone rubber. The advantage to the spoon probe is that it stays in place better than the pin probes.

image showing spoon backprobe in electrical connector

Buy backprobe pins

Backprobe pins pierce into the elctrical connector.

Lisle 64750 backprobe pins

Lisle 64750 backprobe pins

© 2012 Rick Muscoplat

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Posted on by Rick Muscoplat



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