Ford 302 alternator issue

[Jakem]

Good day...my alternator does not register any voltage and I get low voltage warnings on my finder. Now if I rev the engine up and or at cruise speed it kicks on. Any ideas why.

 

[alldodge]

Should be in the motor section
Most likely you need the ALT rebuilt

 

[Jakem]

Ok I wasn't sure what section...

 

[alldodge]

I'm assuming this is a Merc 888, maybe let us know for sure so Mods can move it

 

[Jakem]

It is yes...

 

[Bondo]

Ayuh,..... Generally speakin', an alternator doesn't charge til the motor hits 'bout 1100 rpms, at 1st start, but once it kicks in, 'n is chargin', it should charge, even at idle,.....
A volt gauge should show 13.6v or higher, dependin' on the state of the battery,....

 

[Scott Danforth]

could be regulator going on the alternator. your local alternator and starter repair shop can fix you right up.

 

[ROY WILLIAMS]

Good day...my alternator does not register any voltage and I get low voltage warnings on my finder. Now if I rev the engine up and or at cruise speed it kicks on. Any ideas why.

the alternator is a corrosion on the diodes .....
my 1984 camaro I did the lower voltage amp alternator .. voltage dropped 10volts running the engine 305CU ... I fixed it cleaned the diodes voltage it 14.25volts...
I know the boats are a lot of corrosion electrical issues ..