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BATTERT LIGHT / BRAKE LIGHT after new alternator? Help
hey guys, I just picked up an Evo 9 MR. The car has the Brake and Battery light on full time. The last owner told me it’s been on Sincd he replaced the alternator and has not gone away. I searched all over as I see the brake and battery light is a common sign that the alternator is bad. The car is charging and from what I can see in the MR volt gauge it’s at 14.5. I have checked the fusesble link on the battery and all looks well. Any ideas how to turn these lights off? Is this a possibility of running an aftermarket alternator and the electrical system wanting an OEM? Any info would be greatly appreciated, I don’t want to replace a good working alternator unless it’s the only way to clear those lights. |
By the way, I apologize for the typos, just stopped off the highway to make this post quickly and did not re-read 🤦🏽*♂️ 😂 |
Whats the age of the battery? Curious if its time to replace?
Question, with the Alt light on, does that not throw a CEL? If so, clear any present codes Wonder if this could be a ground issue? Anyways, just throwing out some ideas:crap: |
14.5v is a little high for a running car. Is it at that voltage at idle too? Does it dip in voltage under load like headlights, defroster, etc.? Is the alternator an OEM or aftermarket/rebuilt unit?
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The MR gauge is not reliable. Get a reading off the battery or alternator post.
I had a pinched wire that reeked havoc on my system after an alternator install. |
Originally Posted by BillAce
(Post 11838968)
14.5v is a little high for a running car. Is it at that voltage at idle too? Does it dip in voltage under load like headlights, defroster, etc.? Is the alternator an OEM or aftermarket/rebuilt unit?
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Originally Posted by MikeyT
(Post 11838990)
I just watched the gauge (not sure if its accurate or not) and when the headlights/ ac/ and wipers are on it does a dip down to 14v and teeters between 14v-14.5v. I hooked up my snap on scanner from work and tried to see if it showed any faults through a full scan but it shows no codes. I suppose ill try a volt meter later just to double check.
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Originally Posted by Project_Broke
(Post 11839009)
My MR gauge showed 14.5 and it was a whopping 16.5v at the battery. Overcharge FTW.
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Like I stated above, mine was due to a pinched wire.
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Originally Posted by Project_Broke
(Post 11839018)
Like I stated above, mine was due to a pinched wire.
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Originally Posted by MikeyT
(Post 11839020)
which wire ended up being pinched for you? I know it will most likely have no relevance to me but gives me a place to start ha!
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I just put my volt meter to the reference wire to the alternator and it seems to be charging at 15v-15.3. I turned on headlights and Ac and it dips down to 12 and then back up to 15v. Is this due to a regulator issue in the aftermarket alternator? |
It is high. So either the regulator, or the reference wire issue like I had would be culprits. |
[QUOTE=Project_Broke;11839466]
It is high. So either the regulator, or the reference wire issue like I had would be culprits. ahh okay. Im going to go a bit deeper into it and see whats going on. Thanks for the help Project_Broke! Ill report back with what I find when I do. |
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