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Wiring diagram from the alternator to the fuse box and from the fuse box to the ECM needed

Tiny
AWHARENESSEM2
  • MEMBER
  • 2001 HONDA CIVIC
  • 1.7L
  • 4 CYL
  • 2WD
  • MANUAL
  • 232,721 MILES
So both the battery and alternator tested good. I’m looking for schematics of the wiring diagram from the alternator to the fuse box and from the fuse box to the ECM. Is there anything y’all recommend trying?
Tuesday, September 28th, 2021 AT 7:27 PM

10 Replies

Tiny
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  • MECHANIC
  • 6,383 POSTS
Hello,

I have attached the charging system wiring schematics (look below).

What kind of issues are you having?
Does it not stay running? Does the battery drain?

https://www.2carpros.com/articles/how-to-check-wiring

Let me know a little more information.
Thank you.
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Tuesday, September 28th, 2021 AT 7:50 PM
Tiny
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It stays running but the battery light is on and can’t seem to figure out why when everything checked out fine.
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Wednesday, September 29th, 2021 AT 8:03 AM
Tiny
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Appreciate the schematics and all but I have no clue what I’m looking at in all honesty that’s like foreign language to me. But thanks anyways.
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Wednesday, September 29th, 2021 AT 8:09 AM
Tiny
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Battery light gets illuminated if the alternator is not providing enough power to the battery when the engine is running.
Check to see what is the output to the battery with the engine on. If the alternator tested good off the car but it has low output on the car, this means there is a wiring issue.

https://www.2carpros.com/articles/how-to-check-a-car-alternator

Check the battery fuse. It is located in the fuse box under the hood (look below for fuse box diagram). It should be number 19, 80A.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Let me know of any questions.
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Wednesday, September 29th, 2021 AT 9:37 AM
Tiny
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It reads 12-12.4v when off and 14-14.5v when running.
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Wednesday, September 29th, 2021 AT 5:43 PM
Tiny
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So, the alternator is producing the proper voltage to the battery. So, the battery light being illuminated should be an issue with the circuit for the light. Likely it has a short and turning on the light. Was the main battery fuse good?
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Wednesday, September 29th, 2021 AT 8:41 PM
Tiny
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Yes, the main battery fuse is good and where is the circuit for the light located? If you don’t mind me asking.
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Wednesday, September 29th, 2021 AT 8:43 PM
Tiny
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It is the harness that is connected to the back of the gauge cluster.
There is a fuse in the fuse box that is located under the dash.
Check the fuse number 4, 10A. It is for the alternator. That could be the issue.
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Wednesday, September 29th, 2021 AT 8:53 PM
Tiny
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Oh, okay. Yes, I’ve checked every single fuse one by one and none of them were blown at all.
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Thursday, September 30th, 2021 AT 1:29 AM
Tiny
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Got it. So, all you have left is to check the wiring to find the issue on that circuit. If you want to try that approach, this article might be helpful to you:
https://www.2carpros.com/articles/how-to-check-wiring
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Thursday, September 30th, 2021 AT 6:55 AM

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