Question about Alpine Cars & Trucks
Testing amplifier outputs with a voltmeter will have you doomed to permanent head-scratching.
If the amp is switched on with no input (music or speech) then you will be measuring the quiescent output voltage and in that case I am surprised it is as high as 6v.
If the amp has an input then like the input signal the output will be an alternating one and not something that can be successfully measured with a dc voltmeter. With an ac voltmeter you might get a reading that is around the average value of the signal and that would be expected to be around half the line voltage.
If it wasn't arranged like that the speaker wouldn't be able to function properly by pulling and then pushing. In order to do that the polarity of the output changes at the frequency of the input signal, in other words the output is an alternating current.
There are lots of variables, not the least of which is the design of the amplifier and whether it is decoupled or not. Some amplifier designs will produce a voltage swing greater than the supply voltage and mostly solid state or transistor amps are primarily current devices and not voltage devices and to some extent testing with a voltmeter isn't appropriate. If you really want to know about your amplifier the only reliable method of testing is by using an audio signal generator and an oscilloscope.
If it works why worry...
Posted on Apr 02, 2016
If you are getting 6v at your speakers, you have serious problems with your deck. Also, speakers don't share the common ground (chassis) with the vehicle. They need to be directly wired to the deck, which means you shouldn't test the output of the speaker wires using the chassis as a ground point. If you did this you may have already damaged the deck.
Posted on Apr 02, 2016
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Posted on Jan 02, 2017
if you want the same voltage but with increased capacity connect positive to positive and negative to negative on each successive battery ---connected in parallel
example 6 X 12 batteries each of 200 crank hours will be equal to 12 volts and 1200 crank hours ( good for mobile fridges , winches , battery hoists etc)
if you want to increase voltage in the bank then connect positive to negative for each successive battery ---connected in series
with 6 X 12 batteries of 200 crank amps you will have 6 times the 12 volts which equals 72 volts and the current flow is increase from 200 crank amps to exceed the 1200 crank amps because of the electrical principles and formula I think it works out to be around 72 times the 200 crank amps ( I am sure that there are mathematicians out there that will adjust the sum to make it correct)
However I think that you get the idea
when charging batteries it is always positive to positive with the battery leads to the first battery in the bank and the difference is if in parallel the charger has to be big enough the charge at the accepted rate of the batteries ( 12 volts charge at 14.5 volts and around 20 amps an drop back as the batteries charge
when the batteries are in series it all changes and best talk with a good battery supplier as to how it is set up and if you need to change the charging circuit and equipment
Posted on Jul 19, 2015
I'd start by checking ground connections. How are you checking voltage at the relay? Across the coil, or coil to ground? Coil to ground is important to check.
Posted on Oct 23, 2015
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