I bet you have never used a power probe like this HD 1080p

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realfixesrealfast

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Glad to see you are doing better. You truly are the Godfather of Diagnostics. Cheers.

jonhein

Same thing we where doing in 1992 at the Buick Dealer as our maximum reading was 0.020Vdc. It is electrolytic compounds in coolant regardless of color that conduct electricity and if strong enough can store it. Providing two clean grounds with Star-Washers to dig into the metal, applied dielectric grease to the fasteners drops voltage to 0.003Vdc on a Fluke 87-V. As coolant is moved thru the block by the circulation pump, it induces voltage into what ever color of coolant you have. The same as rotors on a helicopter slicing thru the air picks up a static voltage that must be discharged if towing/lifting an object. Otherwise it will feel like a bad plug wire.
In the late 60’s, GM placed ground clips between the heater core and ground that most threw away.
Since ground is created at the end housing of an alternator thru 3 negative diodes, it to can cause a system wide voltage drop and easily be found with engine on, lights, blower fan on high. Add clean ground from the block to the alt case to correct.
A/C voltage leakage is another issue never checked, as this indicates a diode failing in forward bias. Same again, engine running, lights, blower fan on, test on A/C scale of Digital multi meter from alt B+ to battery ground at 2k RPM. If reading exceeds 0.060Vac, diode is failing. A/C & DC exist within the electrical system. If checked at battery, reduce acceptable Vac by 2/3rds. The battery acts as a capacitor smoothing out the A/C ripples, so best to always test at the alt B+ terminal for best reading. Too high A/C ripples interrupt serial data signals as well. If too high, various systems work/don’t work and more than 2 or more “U” codes are stored in history, then check the alternator as described.
The “REF” is ground in schematic and are dedicated grounds from MAF, MAP or TPS as these must run thru up to 4 sections of controller of engine running thru computer/ECM/PCM at 2k RPM to battery via G100 & G101 from harness indicates voltage drop is excessive if over 0.400Vdc, which is industry standard. Once again, battery ground to block, intake to cab/chassis/frame or subframe is required w/star washers, dielectric grease and clean of rust to allow engine, body, chassis controls to work. I genuinely hope this information is provided to the crop the tool box owners who do not know how carbs work, 2-stoke engines & their fuel pumps function as they were born into EFI. True mass produced EFI vehicles hit the market in 1976, Cadillac Seville & Datsun 280Z. I worked at the Datsun dealer. Do not confuse EFI with CIS or mechanical systems by Hilborne and Mercedes. True EFI as we know it started in 1984 as the Buick Grand National with 1 injector firing in order of firing. The distributor was only a cam position sensor, that had to be synchronized with the correct cylinder then retarded to proper setting.
DK, ASE master tech since 78

deankay

That’s a great idea! Thank you very much. I have never thought to use my power probe to check for electrolysis. I’ve always used a DVOM. From now on I won’t bother. The power probe is my go-to electrical diagnostic tool. Probably one of the the most fantastic tools in my cabinet.and I use it several times a week on customer cars and trucks. Just makes things so much simpler.

billstephenson

As a sailor with my little outboard attached, we were always concerned with stray voltage at the dock. We never left our propeller or engines in the water when or boats were nested in our slip least we have our outboards engines slowly dissolve. But I had never even considered the same happens internally with the engine in your automobile. Eye opening! Conversely when I served on the sea with my job for many years on a 470’ vessels, it’s hull was purposely charged with a tiny bit of voltage to combat corrosion in a saltwater environment. This and sacrificial zinc calmed frightened molecules of metal from leaving. Great video young man!

crawford