QuestionI am replacing my factory speakers in a 2000 Chevy Blazer and the wiring is kind of funky. I have no way of knowing which is my + and which is my -. Is there any way I can positively identify which is which? Thanks.
Answer
Good question!
A very overlooked part of an install that should be done correctly.!
The easiest way will be to use a 9v battery to 'pop' the speakers (only long enough to see whether they go IN or OUT of their frames) to see which lead is positive.
Attach some wires to the battery of different lengths so it will not drain when not in use.
Now.. get into a position where you (or an assistant) can see either the back of or the front of the speaker being tested.
Tap the extended battery leads to the speaker (for 1/4 sec or less) and watch the speaker.
During this test, a functioning speaker should move one way, then return to its idle position.
If the speaker cone jumped OUT of the frame (towards interior of vehicle) the POSITIVE lead on the battery is indeed hooked to the positive for the speaker. Viola!
If the speaker moved IN towards the interior, the NEGATIVE battery wire is indeed hooked to the positive side of the speaker.
I hope that helps. This is a standard preferred professional troubleshooting method when you do not know.
Sincerely,
Jerry Mael
