A/C causes alternator output charging voltage to drop

HONDA CIVIC
Avatar
GPWALTER
  • MEMBER
  • 1 POST
I have a 2001 Honda Civic LX sedan with 133,000 miles 1.7L with A/C. The a/c causes the alternator output to drop from 14.2 volts to 12.6 volts and eventually causes the car to quit running due to the battery being unable to maintain the correct voltage. Have anybody ever heard of this before? I originally thought the alternator was bad but, with all accessories turned on the alternator produces 14.2 volts until you activate the a/c. Can anybody help me?


Thank youi
Oct 5, 2007 at 9:53 AM
Avatar
FAIRRACING31
  • ✓Experienced Mechanic
  • 150 POSTS
You could have a short in the A/C clutch, You still need to have your battery and altenator checked out. It is possible that when you turn your A/C on, you lose enough RPM that the alternator cannot keep up. Also be sure your battery terminals are clean and cables are working fine.
Oct 5, 2007 at 1:09 PM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle