Alternator Problems

[latch]

Kinda new here, don't post very much, but I've have an alternator problem that I know others can spread their knowledge about.
98 ProStar 190 with 350 Chevy Engine.
Alternator only appears to be putting out 13 volts. Holds a steady 13 until I put radio on, then drops down to about 12.5
Alternator, voltage regulator, or what
Please help out

[Cloaked]

Here's a search result for you to browse. But honestly, your readings seem fine to me.

http://www.tmcowners.com/teamtalk/search.php?searchid=114896

[NatesGr8]

mine seems to hold a constant 13 unless i'm filling the ballast or have the blower on then its between 12 and 13, radio doesn't influence it much since its only two speakers.

[lakes Rick]

If your basing this off of the stock gauges, in my opinion they are not very accurate.... Your probably fine if so.. If you want to make sure, Take off your alternator , take it to an Alternator/Starter repair shop..NOT an autozone or other flaky auto store.. Have it tested, if its ok enjoy summer.....

[wesgardner]

Hey latch,

When you take that alternator off, CLEAN the mating surfaces (where metal touches metal) as this is half the electrical "equation" - the negative side...I've gone thru all this and finally have everything charging and starting fine BUT ALL wiring and end fittings as well as the matings surfaces have to be CLEAN and SECURE to produce the correct amount of current/voltage....


Wes

[Andyg]

Check and make sure yout alternator belt is tight. On my 97 PS190 (LT-1) the belt tensioner pulley failed and caused the alternator bracket to eventually brake. I noticed something was up when I saw my volt meter drop to about 12 volts. The belt was slipping on the alternator. Here is a photo of the broken alternator bracket.