I just did a JDM B20 swap, I have cheked the altenator it is good but for some reason the battery is not charging. Does anyone have a idea about this problem??? what else could it be?

 

Bad battery!?

 

i have took the battery out and charged it seperate and it charges but will go dead again because of the lack of it charging while in the car.

 

Altenator. go up to your local schucks/o'reillys or autozone or something of the sort and they can test your altenator but im pretty sure thats what it is. if it is holding charge when you charge it outside the car but when you put it back in it drains and wont recharge the only thing that i can think of is the altenator call before you go in they may need you to pull the altenator before bringing it in lemme know if i was right

 

take the car to autozone and have them test your alternator. obviously the alternator isn't charging the battery

 

sweet im just glad i wasnt the only one who thought that

 

He has already gotten it tested

 

what is the alternator charging at... should be charging 13.60 volts at the most but get battery charged and tested and check alternator output

 

the alt is charging when removed from the car (bench test) brushes are good too. when installed in the car it does not. I am getting a ELD code! I am getting power to the alt (checked with test light) but still no charging of the battery...

 

Is 7.5A fuse 15 blown?

 

i will look tomorrow... what if it is ?

 

Then that's the problem.

 

LOL I meant what would make it blow if indeed it is?

 

Installing battery backwards.

 

HAHAHA

If the fuse is good, make sure your grounds are good as well. Clean them good.

Kev

 

just buy a new battery :p

 

Start by clicking on the Fuse 15 TSB in my signature.

 

OK so no fuses blown, all grounds are clean and connected I think 3 or 4 not including the headlights. And yet still no 14.4 volts coming from the alternator. The single wire maybe 8gauge has power verified with test light on the alt.
where do the 4 wires on the plug go to (alt) I would like to ring them out to make sure no shorts?
Any ideas???

 

Come on honda gurus HELP ME PLEASE !!!!!!!!!!!!!!!!!!!!!

 

did you test the alt? if its not the battery, and not the terminals.... and not the battery cables (which do go bad)
it's more then likely the alternator. OP only said he has test battery and connections...no alt test.

They sell alt gauges....that will tell you immediately if your alt is good or bad. They are 4 bucks...go pick one up before you start trying to sort out wires.

 

[QUOTE=redm3turbo;45600738]did you test the alt?

Yes I took it out and had it checked at a alt shop even took it apart to check the brushes.


ITS GOOD

 

maybe the cable from alternator to battery is bad. or not tighten properly. But i really think maybe u got the wrong alternator. Or maybe ur belt isnt tight enough. Just food for thought.

 

check your connections from the alternator to the fuse box

 

i have a similar issui have a 99 civic with a d16y7 ok here is mine My car had died driving one day and i thought it was my alt cause my dash and head lights went dim and then i lost power but no battery light came on. So i thought it was alt so i replaced an alt and chrg the battery car starts and holding at a 12v to 12.5v so im like **** its not chrging still so than i followed the wire from the back of the alt to the fuse box and found it was fried so i thought maybe my eld went bad to because this wire had fried so i had replaced the fuse box and the wire but still only chrging at 12.5v also now my head lights don't work it have a 35W hid kits i thought it could have caused a short but i had unhooked the hids and put in regular bulbs and still no lights.Also where exactly is the 15Amp or 7.5 amp fuse that everyone is taking about located?? so i'm lost now i dunno what is causing it not to chrg. Any Help?????

 

Check for the Alternator SP fuse. This fuse will usually blow and the number one way to figure that out is by checking you speed tach. It will stay at zero and never measure your speed. That should be the 7.5 fuse. Be sure to use the right measurement because if you use a larger one you can potentially allow a larger current to surge through and melt the wire.

Next, Try starting the car and then turn it off. Go back and check the Alt. SP fuse in the fuse box located under the steering column. If it's blown then you have a frustrating problem. Make sure to check your engine harness and be sure that there are no wires touching anything. Next, make sure all of your ground wires are grounded properly and that they're rust free and grounded the "right" way. Once you've checked those, try the same start up and fuse check process. If it's still blowing there's one last place to check.

Go under your vehicle and look for your o2 sensor. A lot of times if your car is at a lowered ride height and you hit a bump it will cause the o2 sensor to hit the tranny/block of your motor. Thus, creating a short, blowing your fuse, and creating your alt. to receive no power to charge your battery.

Hope this helps.