whos smart about 16v setups?

[tommyk90 5,000+ posts]

Once your alt turns on the charging voltage is fine, so what's the problem?

The only reason your front battery is going down to 12.4 is because the alt isn't charging and the car is running off the battery.

This would hold true even if you weren't running 16 volts and your alt didn't turn on at low RPM.

What brand is the stepdown module? I know the powermaster ones have two options for how low you want the voltage to drop.

 

[slam 5,000+ posts]

Once your alt turns on the charging voltage is fine, so what's the problem?
The only reason your front battery is going down to 12.4 is because the alt isn't charging and the car is running off the battery.

This would hold true even if you weren't running 16 volts and your alt didn't turn on at low RPM.

What brand is the stepdown module? I know the powermaster ones have two options for how low you want the voltage to drop.

so this can be happening cause my 16v battery needs changing and my 12v does not?

this would make sense cause the 16v barrtey hasnt been charged in about 5 months

I have whats called a 16v tap...... two 2v cells wired in series to the 12v battery

 

[slam 5,000+ posts]

also, why is the back charging at 18volt and 12 up front? wouldnt that mean the alty is charging. I thought the step down just drops the volts

 

[slam 5,000+ posts]

nebody know

 

[slam 5,000+ posts]

also, why is the back charging at 18volt and 12 up front? wouldnt that mean the alty is charging.

^^^

 

[audioarsonal 10+ year member]

You may be pulling to many amps through the step down.I know the PM is rated at 25a cont. 50a max.

 

[DBBOOM 10+ year member]

the alternator probably doesnt turn on until 1500RPM.
Or the regulator could be bad and allows voltage to go up higher the rpm. Rev the engine higher than 1500 rpm and if it quits going up then its just the alt doesnt turn on until then.

What good is an alternator if it doesnt turn on until 1500rpm? Get a http://www.DCPowerinc.com .

 

[slam 5,000+ posts]

What good is an alternator if it doesnt turn on until 1500rpm? Get a http://www.DCPowerinc.com .

thanx. hopefully i get answer today with batcap and ea

 

[DBBOOM 10+ year member]

No prob let me know and i'll get a price 4u.

 

[Mike465 10+ year member]

I have a step down but after reading I found that they are not that reliable. I have 10 powermaster 16v's in the trunk and i think I am going to get a HC16V for under the hood since it has a 12v post on it. The step down's generate alot of heat and they spike to much. With the poermaster one you can drop the voltage either 2.6 or 3.4 volts

 

[slam 5,000+ posts]

I have a step down but after reading I found that they are not that reliable. I have 10 powermaster 16v's in the trunk and i think I am going to get a HC16V for under the hood since it has a 12v post on it. The step down's generate alot of heat and they spike to much. With the poermaster one you can drop the voltage either 2.6 or 3.4 volts

well i found my problem. I dont have a step down but it acts as one. i have what u call a 16v tap but found out i need to match resistance of the batteries so itll work properly

 

[Mike465 10+ year member]

well i found my problem. I dont have a step down but it acts as one. i have what u call a 16v tap but found out i need to match resistance of the batteries so itll work properly

Thats very odd, I just feel better using a three post 16v bat

 

[slam 5,000+ posts]

its the same concept but cheaper route and will work with any other battery

 

[Mike465 10+ year member]

That is true

 

[DBBOOM 10+ year member]

Thats very odd, I just feel better using a three post 16v bat

How do discharge from the fourth cell(i.e. one between 12v-16v) when using the 3post? Answer: you dont, that cell is overcharged and eventually causes battery failure, unless you have something drawing from the 16v post you are going to have a problem. Post a thread and get experiences if you dont believe me.