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Possible Alternator Problem?
On Jul 16, 3:15 pm, Jolly Roger wrote:
Hey thanks all - After some investigation - it was found that the alternator & voltage regulator in this boat (made 37 yrs ago) are two separate components. The most interesting part is that after having the alternator tested by the mechanic and having it check out okay! We ended up testing the voltage regulator and low and behold it was no longer working - 37 yrs on the job wasn't too bad. Anyway - just wanted to let you all know what the resolution was. On Jul 5, 7:32 pm, Tim wrote: On Jul 5, 9:12 pm, wrote: Most likely thealternator/voltage regulator, usually the same unit these days. Many NAPA auto parts stores can test it for you, otherwise find a good localalternatorshop. Most alternators can be rebuilt for a reasonable price. Just be sure thealternatorguy understands this is a marine alternatorand you need all those funnyy screens he has never seen before. Make sure he puts them all back. Other than that it is a regularalternator. Er, almost. a 1970 model. Mercruiser? OMC? Anyhow, look for a blown fuse first. then.... If OMC, it probably has an ancient Prestolite, which is way difficult to get parts for, but usually don't go bad no matter how many hr.s are on them, that is, unless the berings get rattly. Either that or if Mercruiser, it probably has an old 10 DN Delco (seperate VR). or maybe even a Motorcraft (Ford) These alternators (if external regulated) is easy to test. Make sure you have a good quality connection to the output stud on the back of thealternator(Usually 10 guage wire) It should be hot full time. It "usually"connects directly to the battery cable at the starter solonoid. Make sure you have good current there. and the nut isn't corroded. Eitheralternator, disconnect the "field" , or "brush" wire. It should be marked with an "F" or "Fld" right on thealternatorhousing. then when running, use a jumper wire to the Battery Pos. and to the "Field" terminal, thus by-passing the volt reg. with a volt meter, the voltage should start to climb 15- up to 17 volts on the guage. That is if thealternatoris working correctly. It it is? then Volt reg. time, or look for rusty connections and corrosion. clean terminals,connections, rusty mount etc. ... plug fld wire back onalternatorand try again. If no go, replace the VR. If internal VR, it's probably a Delco 10 SI but they didn't start using those till after 1973 or 75, I can't remember, but it's doubtful it would have one of those unless it's been retrofitted. Prestolite, (OMC) started mounting a VR directly to the back of their units in about 1975 Thats really basic, Unless I know what you have I can't do much more.- Hide quoted text - - Show quoted text - Cool! |
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