We call all these the " MacGyver Techniques "..also known as another way to Skin a Cat..!!!!!

I use to watch an oldtimer spot weld with a 2 12V batteries in Parallel and a coat hanger fluxed up with 20 Mule Team Borax....and his welds looked decent....:):)

This other Tech I worked with used to test his scanners 9 V batteries for charge condition by putting them across his tongue...it worked , but I never would try it....I would tell him I could tell the amount of charge left by looking into his eyes when he did it ....

Good job

Ill check that orfice after I do a visual inspection, fuel pressure test, component tests and service bullentins.

<rolled the middle of the coat hanger around a 2 inch pipe to make some sort of loop like a resistance. slide 2 small pieces of wood at the end of the coat hanger and then he just plug one end of the hanger to the battery neg and quickly put the other to positive side of the battery.
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Years ago , I actually made a battery load/draw tester using an old section of heater element from a cloths dryer...I wired a V meter across the element and hooked up battery cable ends to it...you hooked the bat cables to the car battery and watched the V meter drop, then see if it returned right away after you unhooked the cables ..used it for years until they finally started making the heater one we are all so familiar with now..

I also got one at a sale for a buck that had a bad meter, but the heater was still intack and the cables/chassis was still good..so I just put 2 meter leads female jacks in place of the shot meter so you use the tool for applying the load, but the V monitoring is done by simply plugging your DMM into the jacks ...slick..........