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18 volt daily driving diagram

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what do you do if for some strange reason your 16 volt battery bank (charging at 18 volts) goes flat therefore you will need a jump start but you dont know anyone else that runs 16 volt batteries, do you need a 12 volt starting battery at the front or is everything getting power straight from the voltage step down moduals?

i am pretty intrested in going with 16 volt batteries because i already have 2 350 SMD alternators from mechman with a ajustable voltage regulator that will charge 16 volt batteries with no problems and because i have not bought any batteries yet i figure it may be worth looking into, only problem is i have never seen it done before so im not sure how safe it is to go to 16 volts.

Edited by alan wilson
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Just have the starter wire were it is easily removable from the battery and connect that to the jump, get it started and you alt will start to charge your bank back up once running.


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Just have the starter wire were it is easily removable from the battery and connect that to the jump, get it started and you alt will start to charge your bank back up once running.

thats not a bad idea thanks for the reply, oh and while you replied i was editing my last post, just thought i would let you know incase there is something else you can help with :good:

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what do you do if for some strange reason your 16 volt battery bank (charging at 18 volts) goes flat therefore you will need a jump start but you dont know anyone else that runs 16 volt batteries, do you need a 12 volt starting battery at the front or is everything getting power straight from the voltage step down moduals?

i am pretty intrested in going with 16 volt batteries because i already have 2 350 SMD alternators from mechman with a ajustable voltage regulator that will charge 16 volt batteries with no problems and because i have not bought any batteries yet i figure it may be worth looking into, only problem is i have never seen it done before so im not sure how safe it is to go to 16 volts.

In your case it will be very simple and more cost effective to run one alternator for the 12V side and one alternator for the 16V side. No need for step down modules and a lot safer and easier.

Most mid and high amps can't take 16V any way, so your 12V alt could handle all the vehicle power needs and the mids and highs with a 12V battery. Then you would have a dedicated alternator for your 16V battery bank.

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what do you do if for some strange reason your 16 volt battery bank (charging at 18 volts) goes flat therefore you will need a jump start but you dont know anyone else that runs 16 volt batteries, do you need a 12 volt starting battery at the front or is everything getting power straight from the voltage step down moduals?

i am pretty intrested in going with 16 volt batteries because i already have 2 350 SMD alternators from mechman with a ajustable voltage regulator that will charge 16 volt batteries with no problems and because i have not bought any batteries yet i figure it may be worth looking into, only problem is i have never seen it done before so im not sure how safe it is to go to 16 volts.

In your case it will be very simple and more cost effective to run one alternator for the 12V side and one alternator for the 16V side. No need for step down modules and a lot safer and easier.

Most mid and high amps can't take 16V any way, so your 12V alt could handle all the vehicle power needs and the mids and highs with a 12V battery. Then you would have a dedicated alternator for your 16V battery bank.

This was my plan but instead of 16v batteries charging to high 18's, I plan to do 14's charging to 16.2 :good:


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If you have the second alt there really isn't a reason to go with 14V over 16V unless you just want 14V or your amps can't take the higher voltage. There is a big gain from 14V to 16V and that is why all the top competitors are running 16V.

Just a side note 16V systems charge in the 19.2V range.

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Then you would have a dedicated alternator for your 16V battery bank.

If this were the chosen option, you would run the charge wire from the alternator to the battery bank as well as ground? Would the fuse size change since you're running at a higher voltage?

I'm not doing this anytime soon, but knowing is half the battle. lol

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How do these step-downs actually work? Any closeup pics of them? How so you run say a few 4 hannels in a 16v setup? Stepdowns and 1-2 12v batts? How do you wire one up and there's like 8 or 10 gauge leads from what I can tell.


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Now this is a base for most vehicles some vehicles will need more stepdowns in parallel but you have to first test your vehicle just email me if you need help with a specific vehicle. I may or may not be able to help. Also I noted elsewhere that doing this gained me 4-5 mpg I would imagine due to the stronger spark and solid voltage from the stepdowns. But by going to an 18volt daily system I get more amperage from the alts the amplifiers draw less and run cooler. So many benefits for the serious minded who want to squeeze every ounce of performance from their daily ride.

I'm sorry and I don't mean to be a downer, but I cannot believe that the 18V alone did this. At least not through your explanation of "stronger spark"

Reason is, the Coil runs off of 12VDC (13.5 actually), and you are having the 18V stepped down. Stepping it down does not give you the advantage of running the 18V. (I know, you can't run your 12VDC coil off of 18VDC without shortening it's lifespan or affecting it negatively in some way. It may or may not harm it, but lets go with the safe guess) Now if the 18VDC stepdown is supplying a higher Amperage to the coil, then I could entirely see how this (stronger spark) would be possible (however since I do not know the full specifications of your ignition system as well as the amperage supplied before and after I cannot say particularly in your case.) But I would like to point out that perhaps increasing the efficiency of the charging system may have had greater effect with lessening the load on the alternator and reducing drag on the accessory loop. (therefor increasing mileage)

Increasing the voltage, will do nothing except limit voltage drops below 12V, which obviously would have the ignition system running optimally at 13.5V. This is good, steady 13.5V provided through the step downs (should) provide clean efficient power to be utilized by the computers and ignition system. However, regardless, low amperage delivery will have a negative impact on the ignition system having full 13.5V or not. I hope this makes sense. I can't really find a better way to explain this.

In order for your hypothesis to be correct, several factors must be maintained.

-Voltage must remain at optimal values. (obviously easily met.)

-Amperage draw must be met or exceeded

-Ignition system must be of better than or OEM spec to actually deliver a stronger spark (higher capacitance and charge delivery) because an old coil will not benefit from greater amperage delivery due to its lower than spec amp draw.

-Wires and plugs must be capable of benefiting from the "stronger spark" as a resistive plug or wires will not deliver gains from a hotter ignition system.

Again, I'm not trying to cause problems or anything. Just delivering my opinion.

Nice job on the setup tho.

One question, why do just 18V? why not do a full 24V?

Edited by Mediarocker

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