How to Test the Charging System on a Honda Rancher 420 | How to Test the Charging System on an ATV

Get a multimeter to test the charging system on your ATV here: www.partzilla.com/product/aft...
When your battery isn’t charging on your ATV, there are three basic elements you need to test: the battery, the stator, and the regulator rectifier. In this video from Partzilla.com, John will show you how to test the charging system on your Honda Rancher TRX420.
We’ll start with the battery, where we’ll use a multimeter to check on the charge coming into the battery. Then, we’ll disconnect the cables from the stator to the regulator rectifier to see if the stator is delivering current to the regulator rectifier. Then, we’ll test the regulator rectifier.
On our unit, we were able to isolate the regulator rectifier as the problem, so we’ll show you how to replace the regulator rectifier on your Honda Rancher 420 and get back on the trail.
Check the links in the video to find more videos on how to test your stator and your regulator rectifier.
See a diagram of the wiring harness on your TRX420 here: www.partzilla.com/catalog/hon...
Read how to do this job step by step: www.partzilla.com/blog/honda/...
VIDEO HIGHLIGHTS:
Introduction - 0:00
Removing the seat and panels - 1:30
Testing the battery - 2:00
Testing the stator - 3:00
Testing the regulator rectifier - 6:00
Installing the regulator rectifier - 7:30
Buy Honda ATV parts here: www.partzilla.com/parts/search...
Talk to us:
Twitter: / partzilla
Facebook: / partzilla
Instagram: / partzilla
In the video we’re working with a 2012 Honda Rancher TRX420, but you will have similar steps for your Honda ATV. If you’re not sure whether these steps apply to your machine, leave a comment and we’ll get back to you.
RELATED CONTENT:
Honda Rancher rear diff oil change:
• Honda Rancher Rear Dif...
Honda TRX400EX how-to videos:
• 25+ Honda TRX400EX ATV...

[@philiptalbotmusic]

Hands down the best ATV videos iv found.

[@CrazyMooseManor]

Probably one of the simplest videos I have seen explaining the testing of the system. Great video.

[@PartzillaParts]

Glad it was helpful!

[@pathoffman6537]

Outstanding details and instructions for repaired on the trx420. It has been a wealth of information that will be a tremendous help with working on my 2013 trx420. Thanks.

[@ironmover322]

Perfectly laid out diagnostics my friend! Your professionalism is Much appreciated .

[@adkbuck]

Incredibly Helpful! Thanks for the clear and spot-on trouble shooting procedure!

[@RADIOACTIVEMASCULINITY]

Very helpful! Thank you for this explanation!

[@wolfgangteichert1525]

Thanks for the easy to follow procedure.

[@myk6694]

had the same problem, got it sorted all thanks to your video, the regulator was giving the .5 reading but where it should be giving no reading it was giving a 1.7 so something was definitely wrong

[@Claygoodine]

Thank you so much this was very helpful!

[@NotAMathAsian]

Great video John with some very helpful info if I ever have that problem. I'm still waiting on the coolant flush on the Rancher 420!

[@damon323]

I second that! I wanna see a coolant flush too!

[@bryanporche233]

God bless you brother for helping us

[@johnsymons6862]

Have you a vid on changing the stator?

[@raynerguzman3527]

Thanks for the information

[@tonydize3944]

Sir you're awesome 👏🏻

[@gradypollard3660]

Thanks man

[@3dconceptsofutah757]

Cheers mate!

[@richardcrossland2383]

Thanks

[@kelseymoe2259]

Hey Jon will it be the same for a 2008 trx 450 er in having a charging problem i have a new stator and regulator can't figure what to check next

[@roverwanderernomadvagabond9059]

I have a 2011 420 Fourtrax. I am getting 15.3 volts on each of the windings. Is that sufficient voltage?

[@samrogerskeeponkeepingon1486]

What should be the voltage coming out of the regulator rectifier when it's off the machine? Thank you for your video hope to hear from you soon. Also I'm only showing 15 volts coming from the stator at idle when revving it can go up to 35 or more

[@ivan199120]

Did you ever find your issue? At idle I’m only at 15 volts as well from stator.

[@pandabeastz]

My 2024 Honda TRX420 Rancher 4x4 has a “knocking” noise when I turn the key on.. I have no idea what to do. I bought 2 or 3 months ago.

[@kirbydees4028]

My 2008 Rancher 420 has a voltage from the stator of 13.68 on all three. I am guessing that is too low? What should a 2008 TRX420 ES 4x4 be? The output from the rectifier is only 8.98 Volts. to the battery.

[@angelasprague241]

What might be the problem if it will not start but you move the gear shifter to the left of neutral before you go into reverse and then press the starter and it starts?

[@remyverdin6491]

Puede poner un video de como checar cdi honda rancher 420 fm 4x4 2013 gracias

[@Ryland2111]

What does it mean if I still only get 20v a/c with higher rpm's ?

[@alaskan49thstate29]

What would happen if you miss a line a trx350fm 2006 4x4 swingarm bolt? Would it cause the swingarm bolt to fallout and not torque to spec? And the swingarm bolts are rusty I'm asking because I've went through it and couldn't figure it out

[@johnnysimlick5788]

Tf

[@douglasfick]

my battery is over charging like 14.8 making my 1993 fourtrax to run bad under load, how to test ?

[@elsenti7]

I checked the rectifier and I get .467 on the neg side .825 on the pos side

[@johnrodriguez7131]

I have a 1997 trx 400 foreman with a charging issue, would the information in this video be relevant for my bike ?

[@gebada7655]

I have the same. Did you determine if it was the same? Thanks a ton.

[@roryfields268]

I have a Honda 125M I got a new Battery for it I ran it not even a block around my house I parked it for a few minutes it will not start no Neutral light or ignition all dead at this time regulator rectifier not sure what it does I ran a screw driver between the two bolts and I got spark it was trying to start but no go I am running 14.00 volts at this time I checked the fuses they look ok not sure what to check next please Help

[@noahdecker8097]

So my stator is only giving me a reading of 14. Would that be where my issue is?

[@juancamacho9136]

Hey hoy mi cuatrimoto no da chispa porque será me puedes ayudar

[@jodyhughes7371]

Stator only producing 15.3 volts. Brand new rectifier and battery isn’t charging. Is my stator volts too low?

[@lsxtrent]

What did it end up being

[@anthonystraight3261]

What it stater is doing 17 out of it

[@jimlarson4594]

Put it in installing a wench on my 2009 850XP

[@Bg_outfitters]

I have power, but no spark Probably my issue

[@markdebassige9485]

My atv shits off when I unplug that wire plug

[@squirtcheeze234]

Same

[@squirtcheeze234]

Have you figured it out yet