HU Installation Help Needed, Please - Page 3 - Car Audio | DiyMobileAudio.com | Car Stereo Forum

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Old 06-07-2011   #51
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Default Re: HU Installation Help Needed, Please

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Originally Posted by jalba View Post
It sounds like you tested from speaker positive to speaker negative though, instead of speaker positive to chassis ground. Disconnect your battery negative cable. Test from each speaker positive on the harness to a nearby chassis ground. You should not get any continuity whatsoever. Then, while you're at it, test continuity from all your speaker negatives to the chassis ground, you should get a very low ohm rating.

Yes, I tested the positive to positive speaker wire and negative to negative speaker wire to make sure they were all connected.

So I should test positive to positive speaker wire and negative to the chassis ground to get no continuity?

And then test negative to negative speaker wire and positive to the chassis ground for a low ohm rating?
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Old 06-07-2011   #52
 
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Default Re: HU Installation Help Needed, Please

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Originally Posted by drwang View Post
Yes, I tested the positive to positive speaker wire and negative to negative speaker wire to make sure they were all connected.

So I should test positive to positive speaker wire and negative to the chassis ground to get no continuity?

And then test negative to negative speaker wire and positive to the chassis ground for a low ohm rating?
That's correct. When testing continuity, you can switch the probes so positive and negative probe used on which end makes no difference, that's continuity testing only though (resistance, ohms, etc..).

Testing from each speaker positive to the chassis ground will tell you, if you find any connectivity, that you have a speaker wire grounding out. To be extra thorough, try this with the doors open and then again with the doors closed. If you have a short that varies depending on if the door is open or not, you know exactly where the short will be.

And testing each speaker ground for coninuity to the chassis ground will determine if they're grounded well enough.
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