How to test which speaker wire is positive or negative?

You are likely right, car electrics are beyond me.


As per my subsequent post though I tested at source (using an AA-battery) and coincidentally all were wired as the Multimeter suggested other than the rear left which was out of phase due to Renault’s wiring.


So in my instance it was lucky I didn’t trust the manufacturer’s wiring!!


As it happens both my new rears are still very quiet compared to the fronts and this is with a new head-unit. Was the same with the old rears and old-head unit, I can’t understand why????

 

Thanks, TBH I can’t confirm either way. They were poor before and they’re still poor.


Forgetting the old head-unit for the time being, I would’ve thought the new head-unit would’ve sent the same power to each speaker (in this case 4 x 50W).


I can’t think it would’ve been pre-programmed just to send a ‘fill’ signal to the rears, but one thing I have just thought of is that I can adjust the speaker levels independently (almost like setting up a surround-sound amp/speakers), but I’ve not tried it out yet, possibly I can send more “signal” to the rears to make them match the fronts – worth a try hey.

 

Thanks, I did similar but just used the AA-battery test for polarity.