simple question about using meters

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sts15l7

Member - Posts: 31

Joined: February 18, 2005

Location: United States

Posted: March 03, 2005 at 1:25 PM / IP Logged

when u want to check whether a wire is getting voltage or not, what's the best way of going about this? for example, in my situation, i have a wiring harness that connects from my car into the radio, and im trying to figure out which wires have power through the ignition and which through accessory. so, i dont want to rip out the wires from the harness or cut the wires to check for this. so, is there an alternative way? thanks

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joebobcletusjr

Copper - Posts: 72

Joined: January 21, 2005

Location: United States

Posted: March 03, 2005 at 4:06 PM / IP Logged

you could always use a pin or a wire stripped at both ends (anything conductive, short and small enough to fit into the harness) be careful not to let the pin ground out, and touch the volt meter + to that pin/wire, and ground out the ground lead on the meter, and see what if any voltage it gets when the ignition is off and try it on. That method takes a really long time, but if the only tool you have is a volt meter it will work.

an easier way to know is check out some manufacturer schematics on your car (and hope no one has changed any of the wiring), it is not a bad idea to test them as well because from time to time they may lie!!! (but probably only if some monkey before you re-did something)

Go here, and look up the color codes https://www.the12volt.com/installbay/vehicles.asp

you could use a light tester if you have one, but if it is an older car, be careful of anything to do with the airbag harness or wires.

I, myself have quite a few of the little kits that you can buy that have connectors specifically made for your car type, and I have attached sheilded crimps on the wires, so they could be tested easily. those really come in handy in the event you forget the color code for the car you are working on.

eh? what did you just say?

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Mad Scientists

Silver - Posts: 380

Joined: February 07, 2004

Location: United States

Posted: March 18, 2005 at 9:05 PM / IP Logged

do a search on 'bed of nails' type probes.

Jim

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simple question about using meters

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