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shepherd92683

Different voltages on same power and ground

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My battery under the hood charges about 14.4 and the battery in the back sits at 12. The Boston amp reads 14.2 and the SQ reads 12. What would cause this?


2017 Honda Accord Touring 

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Sounds like you have a bad connection.


91 C350 Centurion conversion ( Four Door One Ton Bronco)

250A Alternator (Second Alternator Coming Soon)

G65 AGM Up Front  / Two G31 AGM in Back

Pioneer 80PRS

CT Sounds AT125.2 / CT Sounds 6.5 Strato Pro component Front Stage

CT Sounds AT125.2 / Lanzar Pro 8" coax w/compression horn tweeter Rear Fill

FSD 5000D 1/2 ohm (SoundQubed 7k Coming Soon)

Two HDS315 Four Qubes Each 34hz (Two HDC3.118 and New Box Coming Soon)

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For sure my power wires are solid but maybe I'll try to move my ground. It's been in the same place for over a year though and there is no rust, corrosion etc. 


2017 Honda Accord Touring 

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I assume that the Boston at 14 is not hooked to the battery that is 12?


91 C350 Centurion conversion ( Four Door One Ton Bronco)

250A Alternator (Second Alternator Coming Soon)

G65 AGM Up Front  / Two G31 AGM in Back

Pioneer 80PRS

CT Sounds AT125.2 / CT Sounds 6.5 Strato Pro component Front Stage

CT Sounds AT125.2 / Lanzar Pro 8" coax w/compression horn tweeter Rear Fill

FSD 5000D 1/2 ohm (SoundQubed 7k Coming Soon)

Two HDS315 Four Qubes Each 34hz (Two HDC3.118 and New Box Coming Soon)

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5 hours ago, ShadeTreeMechanic said:

I assume that the Boston at 14 is not hooked to the battery that is 12?

I have 2 runs that come from up front. One goes directly to that battery, the other goes to a t distribution block  (battery and Boston amp). So yes but indirectly. 

 

Also today on another test at startup:

Boston amp:14.6

SQ:13.9

Kinetik battery:13.9

 

I haven't checked at full tilt due to not having an open space to do so and don't want to piss off/advertise to the neighborhood. 


2017 Honda Accord Touring 

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Sounds like a bad connection between the T distribution and the battery.


91 C350 Centurion conversion ( Four Door One Ton Bronco)

250A Alternator (Second Alternator Coming Soon)

G65 AGM Up Front  / Two G31 AGM in Back

Pioneer 80PRS

CT Sounds AT125.2 / CT Sounds 6.5 Strato Pro component Front Stage

CT Sounds AT125.2 / Lanzar Pro 8" coax w/compression horn tweeter Rear Fill

FSD 5000D 1/2 ohm (SoundQubed 7k Coming Soon)

Two HDS315 Four Qubes Each 34hz (Two HDC3.118 and New Box Coming Soon)

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On 5/22/2017 at 8:34 PM, ShadeTreeMechanic said:

Sounds like a bad connection between the T distribution and the battery.

All connections and fuses are good. Anything else to look for?


2017 Honda Accord Touring 

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Take your connections apart and look at them. 


91 C350 Centurion conversion ( Four Door One Ton Bronco)

250A Alternator (Second Alternator Coming Soon)

G65 AGM Up Front  / Two G31 AGM in Back

Pioneer 80PRS

CT Sounds AT125.2 / CT Sounds 6.5 Strato Pro component Front Stage

CT Sounds AT125.2 / Lanzar Pro 8" coax w/compression horn tweeter Rear Fill

FSD 5000D 1/2 ohm (SoundQubed 7k Coming Soon)

Two HDS315 Four Qubes Each 34hz (Two HDC3.118 and New Box Coming Soon)

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The only way a wire could have a different voltage from one end to the other is if there is a voltage drop across it or one of the connections. The only way to have voltage drop across the wire is if it is conducting current. That is a very big voltage drop at no load so it has to be a connection going to the terminal that is reading the low voltage. Either positive or negative. You will have to dig into the problem to find the cause.


91 C350 Centurion conversion ( Four Door One Ton Bronco)

250A Alternator (Second Alternator Coming Soon)

G65 AGM Up Front  / Two G31 AGM in Back

Pioneer 80PRS

CT Sounds AT125.2 / CT Sounds 6.5 Strato Pro component Front Stage

CT Sounds AT125.2 / Lanzar Pro 8" coax w/compression horn tweeter Rear Fill

FSD 5000D 1/2 ohm (SoundQubed 7k Coming Soon)

Two HDS315 Four Qubes Each 34hz (Two HDC3.118 and New Box Coming Soon)

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