OK so if I bought a Digital Multimeter..

what would I do with it?

I am installing a DEI Avital 2200 in my Mazda Miata. I think I have located the correct wires to spice into. So the question is what would I do with a digital multimeter (DMM)?

The voltages in the ignition wiring harness, assuming they are hot or constant,  should all be 12V+, since the battery is 12V? I guess the real question is are there some tests I want to perform with my DMM to ensure my alarm system will function correctly or will prevent any potential installation disasters?

I absolutely want to get one if it will prevent any problems or headaches. BTW I saw a nice small one made by GB Instruments at Lowes for $22!

Ciao

yea that should work, if you plan on using it again i would recommend an auto-ranging just because it makes life easier

I like the easy life. What's a good inexpensive meter? BTW Harbor Freight (or Tools) had one for $1.50!

Ciao!

Most wires, if not all wires (havent ran into a wire with a lot more then 12v--but my experience is limited)  will be 12v, in this case, you might want to look into a test probe rather than a dmm.  A probe will let you know if a wire is resting at ground or 12v.  This will be all that you will need...assuming you already have tech sheet--you will just be double checking wires.  Otherwise it would be very tiresome stripping each wire back so that you could check the voltage----apposed to just sticking it with a test probe.  A dmm will come in handy if you need to test resistors before installing them---newer cars these days require resistors.  I would say that you would be safe and be able to save some time by just getting a test probe---but you really should have both if possible.  Just my 2 cents

-Cy

Well I bought one at Radio Shack. It was marked down from $69.99 to $29.99. It looks good, seems well built, and is very easy to use. I especially like the auto ranging. If any of you are interested, the model number is 22-801.

Ciao