Motor Age How2 - Backprobe or Pierce?

If you want to take an electrical measurement or catch a pattern on your scope, you need to access the circuit. How do you do that without causing future problems? Watch this video to find out!
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Due to factors beyond the control of Motor Age, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. Motor Age magazine (UBM Americas - Automotive Group) assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Motor Age recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of Motor Age, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not Motor Age magazine or its corporate parent, UBM Americas.

[@SouthMainAuto]

Good vid Pete, Look forward to the series.

[@howacarworks]

This entire series is outstanding.

[@MotorAgeMagazine]

Thank you! Need to find the time to bring it back.

[@howacarworks]

​@@MotorAgeMagazine I fully understand how much effort it takes!! Great job.

[@mervyncausier6197]

Excellent info without wasting time talking sh*t like most of the other technical vids. Well done !

[@jeffhesse8415]

Nice job Pete. Looking forward to the rest of this series on scopes. Should be a very valuable lesson.

[@mrtopcat2]

Excellent topic. Thank you for this really well made video. It has just what I was looking for about backprobing.

[@mikechiodetti6737]

Looking forward to the series. I found Liguid Electrical Tape at Home Depot. It is messy, but it works, even on sprinkler wiring! Some connectors are to small to back probe, so piercing works. I wish I had that piercing tool 20 years ago. I have it now in my Pico box. I'm retired, but learning the Pico on my (non)volunteered 06 Nissan Frontier V6.

[@josephtucci3666]

Well done sir Keep it up!

[@alexandergonzalez2232]

Peter, thank you!

[@DannerPlace]

Very helpful, thank you for posting this.

[@kasapis6]

Great Video . You ask us for some info about what sort of topics you can talk about . what about some Thermal image diagnostics i have Thermal image camera and wow its almost as good as using my scope give me info that we just could only dream about a few years ago love to see a few videos on this topic thanks for all the great work you always go to with your videos

[@TheBongoZeptobrewery]

great info!

[@johnmckamy6398]

nice tips

[@anthonyizzo1654]

good advice

[@benhurworld]

This man is teaching me so much i might become an excellent mechanic

[@robe5000]

Looking forward to more on the scope! If you could make a video on how I could get my boss to buy one for our shop that would be great!

[@jamesthornton9399]

Getting the money yours or your bosses, tricky. Getting the pay off is hard. Really going to hate to have to work on TV screens, fix them in the car too fix heating and cooling stuff. There should be old tech put back in to control stuff like the HVAC. Bowden Wire controls. Driverless Cars. Driverless cars we have that now, with Twitter at Speed in the car.

[@robe5000]

James Thornton I'm just going to assume you were drunk when you wrote that?

[@cowboy41231]

Thank you for reaffirming the practice! however where is the video "getting friendly with your scope"? part 1? I can not find that video (only #2)

[@MotorAgeMagazine]

Darren Occhiuzzo this was the first in the series to start here and work your way up how to playlist

[@kellyr9388]

Great series Pete.. what is your thoughts on the bed of nails piercing probe.?

[@MotorAgeMagazine]

To be honest, mixed. There are some applications where trying to get to the wire you want is difficult and this may be the only answer. But I would try all alternatives first and regardless of the technique used, be sure to seal any holes made. Soon, I'll be showing you an alternative to piercing/backprobing!

[@freddylee729]

thank you for sharing. How about using the piercing tool to the signal wires that carry very little current/like CAN signal ?

[@MotorAgeMagazine]

I tend to prefer backprobing whenever possible, and certainly (IMHO) when it comes to very small gauge wiring. For the CAN signal, I like to start with a BOB (breakout box) connected to the DLC.

[@notSusNugget]

Would a typical roll of electrical tape not be a suitable alternative to liquid electrical tape?

[@nicholas8479]

Very helpful video. Does piercing necessarily break strands? Or, just very likely or possible. Be interesting to pierce wire and then do an autopsy to see if in fact wire strands are broken.

[@MotorAgeMagazine]

I'd say possible. One reason to use care when cranking down on the probe (IMHO).

[@TheHazyshade]

Its up to chance, I've had luck and just split and could see a hole thru but no broken wires which is just left to seal up after, I use liquid wire

[@nicholas8479]

Like probably most old cars, my connectors are covered with grime. I imagine back probing would push that grime into the connector and cause problems. What's the best way to clean the weather shields without getting junk into the connector? Maybe turn the connector so the weather shields are facing down and then scrub with a toothbrush and contact cleaner?

[@NiteTrain89]

Nicholas Stroganoff maybe try a good CONTACT cleaner

[@NiteTrain89]

www.wd40specialist.com/products/contact-cleaner?gclid=Cj0KCQjw0dHdBRDEARIsAHjZYYCiMpQsm-q3AARuZyznUzdn2QHDrSQ5QX6MTHWB4OZtQX-ZIQnRkksaAmU0EALw_wcB

[@nickkk420]

Thanks I'm trying to verify if voltage making it to my fuel pump, continuity is good at fuse and relay, just trying to avoid buying a new pump if not needed

[@MotorAgeMagazine]

I’m assuming the car won’t start. Do you have a current probe or clamp?

[@nickkk420]

@@MotorAgeMagazine it turns but the fuel pump doesn't even make a hum, I have verified the relay is clicking and fuse is OK, it was a product of some rat chewing at the top of the engine bay, I've repaired all damage I could see, but before replacing the fuel pump for 300+ I wanna verify continuity of the wire run closer to the pump, I don't have a specific probe now I was considering sewing pins and a voltmeter tbh

[@MotorAgeMagazine]

@@nickkk420 If you can reach the connector, you can substitute the fuel pump load with a headlight to see if the circuit is working properly.

[@nickkk420]

@@MotorAgeMagazineI have found that there is a connector under the tank, I'll try to patch in there thanks for the advice

[@autoairsteer]

Calling Dan Sullivan

[@robe5000]

autoairsteer lol

[@mikemini6046]

I was confused, since this video offering was suppose to be a "How To"...All it turned out to be was about "What will Happen If You..."! Where was the PROPER PROCEDURES/STEPS..on how to properly pierce or back probe wiring??! All he showed was the ways that wires HAVE BEEN probed/pierced for years...I DID NOT hear any NEW WAYS to go about getting the job done BETTER, just "what will happen if you do it the WRONG WAY"!! All I can say is: Thanks for taking the time to film this video, but nothing NEW was learned here!!

[@MotorAgeMagazine]

I did cover what will happen if you don't do it correctly. And stay tuned - I will be revisiting this topic soon to show you a third way to access wiring without the need to do either! I have to save something for the future, don't I? :-)

[@jumpninthedarkalley]

Dumb question, but since copper does not corrode, are we actually worried about corrosion from that pin hole? Isnt the insulation just to prevent live wires from crossing???