are starter wires usually neg polarity?

are starter wires usually neg polarity? i have viper 600hf, i test this wire and it is neg

viper's instruction say this:

How to find the (+)12V starter wire with your multimeter:

2. Attach the (-) probe of the meter to chassis ground.

4. Turn the ignition key switch to the start position. Make sure the car is not

in gear! If your meter reads (+)12V, go to the next step. If it doesn’t, probe

another wire.

5. Cut the wire you suspect of being the starter wire.

6. Attempt to start the car. If the starter engages, reconnect it and go back to step 3. If the starter does not turn over, you have the right wire.

i check every wires and that is the only one that doesnt crank at all when i turn the key. i have  94 camry . but when i check on my older car which is a camry too, and it is the same. the car had an alarm on it. it was cutted off to plugged into the relay. am not too sure

are you sure your turning the key to START and not just RUN?

The Camry is no mystery. If you follow the directions exactly as you typed them, you'll see 12v on the BLACK/ white wire when the key is turned to START only.