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<blockquote data-quote="helotaxi" data-source="post: 2272319" data-attributes="member: 550915"><p>Crank your car while measuring the voltage on the battery.&nbsp; It shouldn&#039;t dip below 12V while cranking the car.&nbsp; If it does dip below that you will probably be looking at getting a new battery in he near term.&nbsp; If your system is drawing more amperage than the starter of your car, you&#039;d better have at least one high output alt, period.&nbsp; If it isn&#039;t (and I seriously doubt that it is) and you are getting voltage drops at the amp down to 10V you have inadequate wiring.&nbsp; Most likey the reason that you got good results with a second battery is the proximity of that battery to the amps.&nbsp; Since the extra voltage of a transient that requires dipping into the battery reserve has to only use the ground return path back to the rear battery, the voltage lost on the ground path is less.&nbsp; If you have adequate wiring, especially grounds (large gauge back to the battery), then one good battery will usually have the same result with the car running as adding more batteries in the trunk.</p></blockquote><p></p>

[QUOTE="helotaxi, post: 2272319, member: 550915"] Crank your car while measuring the voltage on the battery. It shouldn't dip below 12V while cranking the car. If it does dip below that you will probably be looking at getting a new battery in he near term. If your system is drawing more amperage than the starter of your car, you'd better have at least one high output alt, period. If it isn't (and I seriously doubt that it is) and you are getting voltage drops at the amp down to 10V you have inadequate wiring. Most likey the reason that you got good results with a second battery is the proximity of that battery to the amps. Since the extra voltage of a transient that requires dipping into the battery reserve has to only use the ground return path back to the rear battery, the voltage lost on the ground path is less. If you have adequate wiring, especially grounds (large gauge back to the battery), then one good battery will usually have the same result with the car running as adding more batteries in the trunk. [/QUOTE]

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