How to you bench test electrical things?, How to you bench test electrical things? Options

[lonewolfe]

I'm curious what you all do to bench test electrical items? I'm just not very knowledgeable about electrical things. I have some gauges, fog lights and other items I'd like to be able to bench test but don't know the best way to power them. Our cars of course run on 12v systems. Is there some sort of device to use that allows one to adjust voltage?

I know this sounds like a dumb question but I'm sure there must be a safe way to test electrical devices for our cars.

Anyone?

[falcor75]

Something like this should work I guess.

http://www.ebay.com/itm/60V-5A-5AMP-Lab-Di...=item35cc32cb15

[type47]

use an old battery that you kept instead of turning in as a core and some wires with alligator clips. Charge the battery with a $20 Black and Decker trickle charger from local hardware store. Easy access to +12VDC and ground.....

[dlestep]

First, you need a bench.
Secondly, you need the right tools.
Then, you make the + thingys run around and smash into the - thingys.
If you can't make that happen, then you need to find someone who knows
what the fuck their doin' !
Otherwise, you can light your cigarette with the horn button, when you turn your lights on.

[76-914]

No such thing as a stupid question. Do you have a multi meter. If not buy one. They range from $3-$400. Most of your testing can be done using the om function of the multi meter. It will tell you if you have continuity or not. IOW, there is a clear unobstructed path for the elec to flow. Or as mentioned above, use an old battery. There are some very savvy and patient electrical gurus here. I'm not one of them so ask away. (IMG:style_emoticons/default/lol-2.gif)

[cary]

Something like this should work I guess.

http://www.ebay.com/itm/60V-5A-5AMP-Lab-Di...=item35cc32cb15

That is cool ................
My other 100 year old 12v only finally died.

[914GT]

I use a cheap Harbor Freight power pack, under $30 with a coupon. Great for testing everything from car radios to starter motors. Has its own built-in trickle charger as well.

[messix]

Invest in some time at the university of Google and get comfortable with electrical terms and theory. If that makes your eyes glaze over then let some one else do the work ...... You will burn down your car if you don't "get it".

[r_towle]

All the devices on the car will require 12 Volts DC, so they can ALL be powered by a normal car battery. Nothing bad will happen.

The device is what calls for, or asks for the AMPS....which is the amount of 12 VDC current it needs....
Think of electricity like a river.
The speed of the river is the voltage
The width of the river is the AMPS

So a little 1 foot wide river wont do any damage, you can walk right through it...
A 100 foot wide river, same speed, will knock you over and drag you downstream....same speed.

Amps are what you need to learn about so you understand wiring sizes, and fuse selection.

You wont overload any electrical device, because it will only use what it needs for AMPS.

Probably a good thing to have a fuse inline just in case the device has a short circuit.

[lonewolfe]

Thanks for all the suggestions! And you are right. I do need to study up on electrical terminology. I didn't even know what to ask for. It looks like either an old car battery or a DC Power Supply should do the trick. I have purchased an ohm meter already.

[r_towle]

Keep asking questions.
Its how you can learn, and there is quite a bit of electrical knowledge here.

Rich

[Tom]

Giving someone advise on how to test electrical things when that person had admitted in knowing nothing about electricity, is bad advise.
Google "basic DC theory" and read up on some electrical theory before you start trying to hook up and test things and you will be much better off. There are a lot of very good websites that explain the basics well and then you will have an understanding when you start testing things and why they work or do not work. Hooking up and testing electrical things without any understanding will quite often result in some sparks and smoke.
If you are committed to testing yourself, some electrical knowledge is necessary and a good multi-meter so you can test the part with the multi-meter before hooking it up to power.
Tom

[Spoke]

Giving someone advise on how to test electrical things when that person had admitted in knowing nothing about electricity, is bad advise.

(IMG:style_emoticons/default/agree.gif)

There is no general way to test items even for a 12V vehicle. One needs to be knowledgeable on every item being tested.

For example testing a dash light bulb will draw a little current (narrow river in Rich's explanation) at 12V but putting 12V across a starter will draw a lot of current.

Best thing to do if one is not schooled in EE is to ask questions here. The 914 world will help guide one through the testing of just about anything.

[lonewolfe]

Admittedly, I need to study up on all things electrical. That is why I asked first before going and destroying something. I tend to error on the side of caution and this is probably one of the reasons my restoration is slower than I'd like. Fortunately, I am very patient and am going through this car slowly as I am building it with the intention of keeping this car forever.

I really do appreciate all your feedback including suggestions as well as criticisms and warnings. It's all good to me!

[messix]

You can ruin some elctrical circuits if you connect them in the wrong polarity.

Google will help you understand the part you are trying to test., just look it up.

And multi meter also known as a volt/ohm meter is a very important tool to have and there is no sense trying to trouble shoot anything electrical on the car with out one.

[lonewolfe]

You can ruin some elctrical circuits if you connect them in the wrong polarity.

Google will help you understand the part you are trying to test., just look it up.

And multi meter also known as a volt/ohm meter is a very important tool to have and there is no sense trying to trouble shoot anything electrical on the car with out one.

I bought a good quality multi meter and have some homework to do before diving into anything. I'll figure it out and probably have some more questions along the way!

[r_towle]

Don't let fear scare you away from learning.
On a bench, maybe you melt some wires, maybe you learn to NEVER do that again.

Some of us enjoy learning the hard way (IMG:style_emoticons/default/smile.gif)

[somd914]

One bad thing about using an old battery is the amount of current that is readily available to melt your test leads or your device under test when a short or near short occurs. (IMG:style_emoticons/default/headbang.gif) That's why we have fuse blocks. Especially for a novice, I'd recommend a low amperage power supply.

Also agree that a multimeter is a must - most troubleshooting is determining whether or not power is getting there, measuring resistance, and determining continuity. An inexpensive multimeter for $15-$30 can do all this just fine for occasional use like working on the teener.

As previously mentioned, search the web for a little education on electrical theory and on schematic reading.

Keep asking questions as you get further along...

[lonewolfe]

One bad thing about using an old battery is the amount of current that is readily available to melt your test leads or your device under test when a short or near short occurs. (IMG:style_emoticons/default/headbang.gif) That's why we have fuse blocks. Especially for a novice, I'd recommend a low amperage power supply.

Also agree that a multimeter is a must - most troubleshooting is determining whether or not power is getting there, measuring resistance, and determining continuity. An inexpensive multimeter for $15-$30 can do all this just fine for occasional use like working on the teener.

As previously mentioned, search the web for a little education on electrical theory and on schematic reading.

Keep asking questions as you get further along...

When buying a DC Power Supply, how many volts and amps are needed? I see they have 30v 3amp, 30v 5amp and 60v 5amp and on and on. Is a 30v 5amp adequate?

[r_towle]

For automotive testing 12 vdc, 20 amps
Should be more than enough for everything except a starter.