09-08-2010, 04:12 PM
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#19 (permalink)
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Enthusiast Member
Join Date: May 2010
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Quote:
Originally Posted by Guard Dad
Jueleous,
On many simple systems one of the speaker leads is a grounded (-) lead and one is a hot (+) lead so identifying the positive lead is as simple as using a multi meter to check voltage from each lead to ground, the one with voltage relative to ground is the positive. However since many (most?) newer factory speaker systems are customarily wired "above ground" the standard test can yield similar voltage on both leads. Note that aftermarket systems label all the inputs and outputs as + or - to allow the installer to properly install their components. The car manufacturer often doesn't label these connections because they design the OEM connectors such that they can't be installed incorrectly.
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My point was to receive a continuity beep you must have a direct short to ground, and you must have no power going through circuit to test that. On any modern amplifier you would not find a direct path to ground, there are many components between the speaker - terminal and actual ground. This would not allow you to show continuity as the semiconductors would not allow the path to be there.
Now going back way way back I remember connecting only one speaker wire and the other side to the ground, but this is going back like 20 years ago. Modern amps have isolated grounding systems.
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