Alt voltage drop

Asked by Crusherman Sep 22, 2018 at 09:16 AM about the 2005 Dodge RAM 1500 ST Quad Cab 4WD

Question type: Maintenance & Repair

The voltage drops when I turn on the ac I checked battery
and alt both check fine voltage drops only when ac is on
and at idle rev up a couple rpm it goes back to normal
range let of drops off it's a 2005 dodge ram 1500 5.7 liter

4 Answers

9,730

It's working just fine, when the engine rpm drops the alternator output drops because it's not turning fast enough to provide full output.

No it dont normally drop like that it's something that just started 2 days ago I've had the truck for 10 years now this is a new problem

9,730

Can you hear a whine coming from the alternator? You may have a single diode bad in the rectifier or a bad stator winding, Do this, with the engine running turn on all loads listen and feel the alternator if it makes a whining noise and will feel rough don't burn yourself, I hope this helps you

Your Answer:

RAM 1500

Looking for a Used RAM 1500 in your area?

CarGurus has 71 nationwide RAM 1500 listings starting at $4,000.

Postal Code:

CarGurus Experts

  • #1
    Dan Connell
    Reputation
    20,270
  • #2
    dandyoun
    Reputation
    15,290
  • #3
    Gene Arnett
    Reputation
    11,760
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Ford F-150
321 Great Deals out of 14,968 listings starting at $1,712
Used Chevrolet Silverado 1500
202 Great Deals out of 5,975 listings starting at $2,975
Used GMC Sierra 1500
148 Great Deals out of 7,258 listings starting at $3,950
Used Dodge RAM 2500
23 listings starting at $9,975
Used Toyota Tundra
35 Great Deals out of 1,184 listings starting at $8,500
Used Dodge Charger
38 Great Deals out of 645 listings starting at $4,888
Used Toyota Tacoma
55 Great Deals out of 1,071 listings starting at $8,708
Used Dodge Durango
46 Great Deals out of 2,266 listings starting at $5,500
Used Chevrolet Silverado 2500HD
16 Great Deals out of 1,285 listings starting at $8,995
Used Ford F-250 Super Duty
24 Great Deals out of 1,204 listings starting at $7,995
Used Jeep Grand Cherokee
109 Great Deals out of 3,238 listings starting at $4,995
Used Chevrolet Tahoe
24 Great Deals out of 911 listings starting at $11,900

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.