electric up front 14.48 stays same rear drops below 12v

[stereohead69 10+ year member]

Ok this is probly a dumb fix ok my front battery both before and after the fuse read 14.48 volts the whole time I play my subs till the amp goes into protect in the rear I have 3 kinetik 2400s that read 14.48 volts as well untill I turn the bass up then they all drop below 12.00 volts sending the amp into protect I have tryed cleaning the same ground that I have used for years didn't help I tryed charging all batteries still nothing different I checked ohms they are still at about 1.28 so I don't know what it could be HELP ME PLEASE.

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[kr15 5,000+ posts]

When this happened to me it was poor connections at my terminals on runs

 

[SounDrive Pro Seller]

Yep, if your voltage up front is fine you may not have enough runs or some of your connections could be bad

 

[myjaja 10+ year member]

How big of an amp are you running? Alt and what kind of power wire?

 

[stereohead69 10+ year member]

The amp is a powerbass xa3000.1 factory alt Rockford fosgate 0 gauge I have been running this setup for at least 2 years with no problems

 

[PSturmer 10+ year member]

i suspect the amp ground is bad. to test this theory measure the voltage between the negative terminal at the amplifier and your negative battery terminal under your hood. if this value is not 0 or very close to it, then i would recommend running a full ground. whenever i run two or more batteries i always just run a full ground and the rear batteries need not even be grounded to the chassis. in other words all batteries are wired + to +, and in the same exact manner they are wired - to -.