Voltage regulator bad?

[starsnstripers]

1984 5.7 Mercruiser, my volt gauge and test meter are reading 14.9V the needle is right on the line between green/red. over charging? Three wire, internal regulator.

 

[JustJason]

Re: Voltage regulator bad?

Whatcha getting for ac millivolts across the batterys + and - ?

 

[wire2]

Re: Voltage regulator bad?

What quality is your test meter? Fluke, Hioki, Amprobe, and a couple others are very reliable. If yours is a "lesser brand", I'd be inclined to try 1 more meter to compare.
After 30 minutes of running, does the battery feel warm to the touch? And the alternator runs hot all the time? If so, it probably is being overcharged.
The nominal voltage of a single lead-acid cell is 2.0 volts. They will accept a bit more but 15v across the 6 of them is too much.

 

[starsnstripers]

Re: Voltage regulator bad?

Snap-On Multi meter, My dash gauge reads the same so i have two sources. I haven't run it very long yet getting it ready for the season. One thing i did was instead of running the hot from the Alt. to the starter i ran it directly to the battery. Could that cause higher output? Haven't checked millivolts but will tomorrow.

 

[starsnstripers]

Re: Voltage regulator bad?

Should i replace the Voltage regulator or Alternator? 14.9 volts is to high. it will cook the batt?

 

[ziggy]

Re: Voltage regulator bad?

hi sns.....

i sure aint the pro as ya know... rhymes don't it...

anyways. the s/m has many tests in it. i'm unsure which to lead you too as i don't know which alt. ya got. a delco 3 wire? maybe ya can read up and do a few tests on it??

or

ya could take it to your local rebuild shop.

yer voltage does seem high..


hope ya had a good holiday...