1999 Miata pindicates 17 volts when running

Asked by Jan 17, 2015 at 11:37 AM about the 1999 Mazda MX-5 Miata Base

Question type: Maintenance & Repair

replaced alternator and have been to several repair places. No one can solve this problem,

3 Answers

13,770

I think the problem still might lie in your alternator. for some reason it is overcharging.

12,520

Turn your headlights on and check the voltage again ... ... If that alternator is still putting out 17 volts, you have one helleva alternator. Most alternators will give you between 700-800 watts and if that voltage has not dropped with headlights on you are hitting close to 340 watts ... without a correction you will soon start having premature failures of everything from Headlights to coil-pacs Most cars run a little over 14 VDC. ... Most alternators have a built in regulator so it gets changed when the regulator gets changed .... however, in todays world where the regulator may be a separate part # ... I would not assume anything

13,770

Tom is right about that! On some models the voltage regulation is shared by the ECU. There are also some cars where there is no voltage regulator in the alternator, but it is entirely controlled by the ECU.

Your Answer:

MX-5 Miata

Looking for a Used MX-5 Miata in your area?

CarGurus has 4,655 nationwide MX-5 Miata listings starting at $1,900.

ZIP:

Mazda MX-5 Miata Experts

  • #1
    Michael Kane
    Reputation
    2,220
  • #2
    Tom Demyan
    Reputation
    1,280
  • #3
    Racer_X
    Reputation
    410
View All

Related Models For Sale

Used Ford Mustang
268 Great Deals out of 38,445 listings starting at $1,350
Used Honda S2000
4 Great Deals out of 327 listings starting at $5,600
Used Chevrolet Corvette
88 Great Deals out of 15,086 listings starting at $3,620
Used Chevrolet Camaro
238 Great Deals out of 27,434 listings starting at $2,077
Used Porsche Boxster
17 Great Deals out of 1,085 listings starting at $3,495
Used BMW 3 Series
920 Great Deals out of 31,690 listings starting at $1,599
Used Honda Civic
414 Great Deals out of 49,826 listings starting at $1,495
Used Jeep Wrangler
248 Great Deals out of 16,520 listings starting at $3,000

Used Cars For Sale

2018 Mazda MX-5 Miata For Sale
2,113 listings starting at $24,410
2017 Mazda MX-5 Miata For Sale
6 Great Deals out of 985 listings starting at $19,965
2016 Mazda MX-5 Miata For Sale
4 Great Deals out of 332 listings starting at $15,599
2015 Mazda MX-5 Miata For Sale
3 Great Deals out of 117 listings starting at $12,995
2014 Mazda MX-5 Miata For Sale
53 listings starting at $13,897

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.