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<blockquote data-quote="CarAudioGuru" data-source="post: 4980214" data-attributes="member: 600532">When you have the rear battery disconnected, will the car &quot;crank&quot; at all?&nbsp; Not start, just crank??&nbsp; Read the voltage when you are trying to start the car.What is it then???&nbsp; If you hook up just the rear battery to the car/starter does it start???IF voltage is still good, even when starting (and anything greater than a .7 volt drop while starting is not good!&nbsp; BTW)&nbsp; Then you probably have an issue with the starter solenoid or stater itself.Batteries should be paralleled, even of you use a &quot;isolator&quot; (not the fake-o solenoid deals, but the big *** heatsink &quot;Shoe box&quot; size kind with 3 - 1/4 inch posts&nbsp; sticking up out of it)Sounds like you don&#039;t have the batteries separated.&nbsp; Then in reality both batteries are starting the car.&nbsp; And if you have dissimilar batteries front and rear, whichever is the &quot;healthier&quot; kills the other battery.But until you do a couple more tests, its &quot;Ouija Board &quot; time</blockquote>

[QUOTE="CarAudioGuru, post: 4980214, member: 600532"] When you have the rear battery disconnected, will the car "crank" at all? Not start, just crank?? Read the voltage when you are trying to start the car. What is it then??? If you hook up just the rear battery to the car/starter does it start??? IF voltage is still good, even when starting (and anything greater than a .7 volt drop while starting is not good! BTW) Then you probably have an issue with the starter solenoid or stater itself. Batteries should be paralleled, even of you use a "isolator" (not the fake-o solenoid deals, but the big *** heatsink "Shoe box" size kind with 3 - 1/4 inch posts sticking up out of it) Sounds like you don't have the batteries separated. Then in reality both batteries are starting the car. And if you have dissimilar batteries front and rear, whichever is the "healthier" kills the other battery. But until you do a couple more tests, its "Ouija Board " time [/QUOTE]

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