Does anyone have a diagram of the grounding points for the Evo 9?
not talking about a grounding kit, just the stock ground points for the engine.
i did search and all i could find was was info on aftermarket kits.

Reason i ask, and maybe someone can shed some light on the issue, is because while driving at night i can see my headlights dim along with my interior lights and my ac loses power as well.

this issue seems to occur more during the warm up cycle and this evening i notice the battery light flickered a couple of times. once the car is warm it might flicker once or twice but for the most part everything stays bright.

i tested with a multimeter last night at the battery and with the car off it read 12.5
car running it read 14.5
from what i understand this is normal and means the alternator is working but i dont think it was during one of the dimming episodes the car has so i cant quite rule out the alternator.

anyways, figured id start with grounds and go from there... any help is greatly appreciated. thank you.

 

I'd suggest pulling the battery and having it tested by one of the auto parts stores that sells batteries. They usually have a quality machine in order to handle warranty claims.

 

the battery tested at 12.5 with the car off
that should rule that out right?
either way it wouuldnt hurt to take it in
thanks for the suggestion, very much apreciated!

 

you have to test the battery under a load. just the car running at idle isnt enough of a load to show you what its really doing.

 

testing with the car running wouldnt give you any info about the battery would it?
the alt. is running everything at that point and charging the battery.
did you mean the alt?
thanks for the input! appreciate it!

 

If the battery was bad, under a load it would be tuff to crank over or wouldnt hold a charge. It is more then likley your alternator, the flickering battery light means its Either A) not charging or B) over charging. You can check connections at the battery, and make sure they are good if they are, then id have a look at that alternator. Ive noticed the issues on these alternator can be intermittent.

 

good info!
intermittent meaning how i described it?
should i try and catch it during one of the dimming times and test it at the battery?

yesterday i took the battery out and cleaned the connections with baking soda and water. there was a bit of corrosion but i honestly seen worse.

the best way i can describe the problem is during the warm up cycle while driving with the lights on. it seems like the alt kicks off and everything runs off the battery. several times through the rest of the trip it feels like it kicks on and off.

this wouldnt be so much of a problem if the alt wasnt such a PIA to remove.....

 

Yep thats how it does it, sounds like Alternator its not that bad to replace once youve done it.
Just go low and remove the CV joint its all cake from there.

 

thanks for you help! very much appreciated!
ive read about people taking it out the bottom on the passenger side by removing the passenger axle. is that what you are recommending?

 

Its gonna be the battery, the alternator or something with the wiring. So, what is easiest to check? Once the battery is known good, move on to the more difficult stuff.

 

thanks for the input!
thats why i was wondering about a layout showing the grounding points. maybe one or more are gummed up.

i figured i ruled the battery out when it showed 12.5 volt when i tested it.

the more i think of it, the more i feel like it might be a combination of the two.

the battery gets really low during start up and the alt is old and cant keep up with powering lights and trying to charge the battery during the warm up cycle. but once the battery gets charged it can keep up just fine.
is that possible?
just something i came up with, have allot of time to think as of late.

 

Yes, other people do it thru the top im not sure how they do it thou i just couldnt see it fitting in my car. So i did it thru the bottom, I also bought a used one and had it rebuild so i could have an extra as a core rebuild for the next time it goes out. typically when a battery cell goes bad, it wont hold a charge it can get up to 12V then under load bog right out. Load test it. Remember if the alternator is intermittinly charging its running right off battery power. What ever you do thou, DO NOT DISCONNECT THE BATTERY While the car is running to check your alternator this works for old school stuff. Not so much for an evo.