Easy voltage boosting harnesses for Mechman GM alternators
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- Опубликовано: 8 фев 2025
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With the usage of so many different lithium-based batteries in car audio, many times you're needing to up the voltage to charge those lithium batteries CORRECTLY.
While some lithium batteries do not require higher voltage charging, some do and it's imperative that you charge your high dollar investment appropriately to get the most power from that purchase.
As always, please consult your battery manufacturer and/or builder to establish the charging goals you need to achieve.
While these are labeled as "lithium" harness, they can also be used for 14-volt batteries that will require a 16-16.5-volt charge rate.
![Deep Cycle Battery Charging with your Alternator: The 3 Best Options explained [+ Wiring Diagram]](/img/1.gif)
Shoutout to Mechman for making life easy! I’ve been dying to get rid of my two blue boxes! Thank you!
Just trying to help out when/where we can.
Trying to buy a 400 amp mechman alt do you have any plugs for a two prong alternator for 06 chevy tahoe and I'm running agm batteries will this work for agm or do you have one for specifically for agm batteries
Thank you for keeping us in the loop I definitely wanna grab one I’m running a 240 amp on 97 Tahoe wit 2 AGM’s .Maryland hearing you loud and clear showing ❤ solid voltage gd wiring not sure which one to grab will re watch I Don missed it😂 Tony !! Thank you
Thanks for sharing. I’m a big fan of “simple” 🙌🏽
Sorry off topic but I bought one of your alternators and I have the same year Chevy Silverado as you 2008 5.3
I was wondering if you remember what size belt or number belt you have for it and then the second question is what harness do I need to add a volt I have 16 volt Ahmed batteries thanks for your content
Bottom of FAQ section:
www.mechman.com/faqs/
A 16 volt battery realistically needs to charge in the 19 or so volt range. At that point you just need to go external regulator.
It’s really a dual voltage Agm battery 15 and 17
Dude, you spoke nothing but facts.
Thanks for doing this 👌
Great video
Thanks!
Lol. I like this guy. Straight to the point. “Don't be a 🫏🥜🫵👀
I've been called a lot of things.... the nicest of which was "ROBOT". :)
i purchased one of these and it did not boost my voltage, I do have a js alternator I did every thing correct the blue on the output of the alternator and the yellow to a 12 v signal. Im honestly not mad just very confused and looking for some help. I have a 320 js altornator the harness connects the the altornator but does not boost my voltage.
We do not know the spec regulator they run which is why we state we've only tested on OEM and Mechman alternators.
@@mechmanalternators do yall have any Nissan Altima high out put Alts?
@@Zachecker Sorry, we only have applications we list on www.mechman.com
Do you make these for ram trucks?
Hey Tony, I have a 2007 Ford F-150 FX2,with the 5.4L Flex Fuel V8. I have a Mechman 250, do you guys have anything to increase voltage to run Lithium?
Have you considered building batteries? 🔋
I have a 08 trailblazer 2 pin style what can I use ?
THIS:
www.mechman.com/voltage-controllers/mm-vc1-2005-gm-2pin-rvc-voltage-controller/
Toyota is on the site now!
Toyota is easy. In the fuse box under the hood labeled ALT. Get an add a fuse and cut the wire off it then soldier two diodes together. Once you’ve soldered them together soldier one end of the diode where the fuse goes in the add a fuse and loop the diode to the other leg of the add a fuse so it makes a complete system. Once that’s done plug the add a fuse into where the fuse was. Be sure to have someone in the vehicle, when you install it, installed backwards it won’t work so you’ll need to flip the fuse around and plug it back in. Using two diodes will put you exactly at 15.3v-15.5v. Use one diode if you want to charge around 14.4v
My 370amp unit which I installed on my 2012 Silverado 3:59 6.6 Duramax, has the opposite problem.
It's been overcharging for about one to two minutes each time I would restart it once it's warm. The voltage would climb into the 16 and even 17 volt area for brief periods , before settling back to around 14.v
It did this for 12 months and I only fitted it in late 2020.
I've removed it and replaced with a standard alternator.
Is there a replacement regulator that I can purchase and self fit?
I'm in Australia so it's not practical to return it to you.
Can i louse these on a brand x alt ? I have a mechman with one and a secondary brand x that doesn’t have one and it’s messing up my voltage
Can you this all the time with a gm Dr44G alternator
why not add a 4 or 5 way switch with the diodes that way you only have to make one item?
Switches fail, people break them, expect us to warranty them breaking them.
will these work on your GM 240 amp alternator ( 2002 chevy blazer 4.3 ), or these just for hairpin's ??
We've ran them on a few before, so yes. Not very optimal as the 240 is the entry level 3phase design and not as efficient as our Denso based applications.
im doing tis mod own my own alt, what happend if i did hookup the diod wrong way
I keep seeing not to hook the 12v wire to a 12v source and that I need to put a resistor in line
Possibly with others, but our regulators are built/spec'd to NOT need one.
I am trying to upgrade my wiring on my 2002 GMC Yukon Slt. Can you help me.
Always, but most questions are already answered on www.mechman.com
What about adding some more voltage to some Fords? Powerstrokes and others?
Most of, if not all of those applications use a higher voltage regulator already.
How much for the harness
Can those be used on the racing alternator you sell?
If it's got a GM 4pin regulator, sure.
Please also keep in mind the higher voltage you run, the HARDER it is to turn the alternator. I only bring this up due to the "racing" word you used and most trying to keep parasitic drag to a minimum in those situations.
Can you run this all the time with dr44g alternator
2017 silverado i have 2 optima yellow top and mechman 370. Can i installed the boost harness?
It’s for 98-08 4 pin alts
Can i use it on agm batteries. Trying to get one for a 2013 suburban but not sure if it will mess with the trucks electrical.
Depends on the voltage. All the information is in the video and www.mechman.com
I have the H104L and the for my second alt P101L they are both going to the same battery how do I know if they are charging at the same voltage? They are both 400 amps a piece.
A voltmeter?
@@mechmanalternators I guess what I’m trying to ask is why would they not charge at the same voltage in the same vehicle?
@@cin5cin1nat3i Build tolerance? heat? I mean...it's electronics, thats how they work. Some of our 400's make like 405, some have made 420. It's a ton of little things that add up in the big picture.
It still wouldn't matter bout voltage. If you had one at 15 volts and one at 14 volts. I was running 3 alternators on my truck at one time. One uplugged 2pin, (13.4 volts), a 4pin (14.7 volts) and a "modified something running at 15.4 volts.
If you want to test individually then just put a meter on each alternator instead of the ONE battery.
@@mechmanalternators thanks for the response I’m kinda new to the whole raising my voltage to charge my lithium batteries. I just want to make sure I wouldn’t like fry my system or hurt my battery if one was a lil higher.
Will this work for me, i have 04 gmc Yukon, 400 amp alt from you all?
Does the alternator have the 4pin plug? If so, then yes.
Is there any way to set a specific voltage level regardless of the alt temperature? Say i want 16v to charge a C max. I don't want it to ever charge higher or lower than 16v. Would I need some type of computer based regulator to maintain an exact output?
Not gonna happen. Its the physics of electronics. It's like trying to keep 32psi in your tires all year round and no matter how drive.
99.9999% of people worry extremely too much over a tenth or 2 of a volt.
Diode is the cheap way i say take out rectifier n voltage regulator n get a rectifier with 680 or two 300 amps etc two spark plugs per cylinder n a good 48 volt battery 🔋 n put sand where 6 cells are so batteries cells since heat expands everything do battery cells dont touch one another with higher voltage n amps u said fire right without flame thrower
So if see 14.2 v currently and get the 1 diode booster you said I should see near 15. Would this hurt a 12volt battery? Or are these harnesses meant strictly for lithium?
I would investigate why your current voltage is lower than standard voltage(14.5-14.9) before throwing money at it.
Do you recommend one of them on a factory alternator for a Honda pilot
No
These work for oem alts right? If not sorry but if I charge at 13.6 and install one it’ll bump me too roughly 14.6?
Depends on which one you choose. Descriptions are on each one.
I already have an 270 amp alt upgrade including my own 5k pot for adjustable voltage, can i still use that if i upgrade to a 400amp?
Sure!
Steve my Amp is doing 320 amps drawing which harness will I need???
No one can answer this. These harnesses change the voltage output. They have nothing to do with the amperage output.
Another question, what if you have dual alternators? Do you need to have this on both?
Yes.
How would I wire mine up on my ls swap I only got a 1 wire on my alternator
12v key on/off source
hello good day, i have a aftermarket alternator on my GM vehicle that has it's voltage set to 14.8 static internally, i want to boost it to 15.2,
it has the same 4 pin connector as on the video, but i only have the blue wire hooked up to switched 12v,
i want to boost the voltage by 0.3-0.4 volt, as 0.5 volt is too much for the vehicle,
Why don't you mention if the alt. For sale is a hair pin or not? Are all of your alt.s hairpin?
I don't mention it as that is what the FAQ and product descriptions on www.mechman.com are for. However, 99% of our available part numbers are true hairpin 6 phase units. We have 3 units that are entry level GM style that use upgraded internals with an overdrive pulley but still follow the 3-phase foundation.
They will make around the same output at top end as a hairpin 250 amp but will be down appx. 30-30 amps at vehicle idle RPM's. Great for the daily driver guys with around 2500w audio setups.
Nothing for the gm 2 pin alts?
P# MM-VC1 handles those.
@mechmanalternators just trying to figure out what all I need to buy for my 06 chevy tahoe I want a 400 mechman alt with the plug to keep battery light off and not sure if I will need a different serpentine belt thanks for the help I appreciate you
@@andrewg7344 All available 400 amp applications for that vehicle are listed on www.mechman.com along with a belt sizing chart for the necessary half inch shorter belt. We also have digital copies of the instructions for the components as well. We even have a how to video on our channel with Sundown Audio.
@mechmanalternators thank you I appreciate all your help
Can i use this with p103 bypass 2005 chevy
Yes....if th alternator is a 4pin style
What about XS Power D3400???
What about them?
Can you use the harness on D3400's
@@nathanjohnson676 You only need 14.4-15 volts for those.
Can this be used on XS AGM BATTERIES?
If it's a 14v battery, yes.
@@mechmanalternators I have a d3400,2-d6500 XS AGM batteries on a Taramps 12k @ .5 ohms and one of your 320 amp alternators,yet my lights blink on the inside…what am I missing here,thanks in advance
@@glovegame6226 Well, you need around 1200-1400 amps to power that amp wired down to the dirt. That poor 320 can only fill your small battery bank soo much.
I mean, it's TWELVE THOUSAND PLUS watts being generated. Your 320 amp alternator is only doing around 140 amps at idle if small case and around 200 if large case.
What size diodes incase of failure?
they don't fail
@@mechmanalternators tell us stop keeping the sauce 😭
@@Mr.boxxchevy Eludium Q36 Modules
@mechmanalternators that's an illudium Q-36 explosive space modulator to be exact
Nice
Car audio and components are way to catered to gm and vehicles that not everyone wants.
Sorry, you can't deny physics that big GM SUV's/trucks are easier and cheaper to get loud than a Honda.
@@mechmanalternators Sorry, still doesn’t mean everyone has or wants a gm.
@@equanox100 Well, we can't make everyone happy, but we try to at least help the ones that need a product we build.
Tony I want your direct #
Don't really have one, I like Email Tony@Mechman.com
OK cool
The easy boosting harnesses for the GM alternator my builder told me my Amp draws about 320 amps its a 24pill mobile Amp which harnesses would I need????
$29? Everywhere i see wants $40. Just tell me what diode and I'll make my own for under $9
No clue on diode type....email support@Mechman.com if you cannot make life simple/easy/quick and just purchase one already made.
Um …..
Why are y’all’s hats so queer now? What happened to the flat brim fitted grey hats? Went to order another and you got some gay ass strap back. Wtf
Please get the gray fitted caps with neon green logo on front and back. Get rid of those woke bs hats y’all have now. Wtf.