Replace alternator? (automotive)

[UNSUREBOATGUY]

I'm pretty sure I already know the answer to this, but the yahoo that had sold me the boat ('87 Four Winns 160 Freedom with 3.0 Mercruiser) installed a new reconditioned alternator (7127M-3) shortly before he sold it. Well, the alternator is an automotive alternator-not marine. How important is it that I replace this alternator with a marine model, and do you have any suggestions for what would be the best one for the boat? I found a Sierra 18-5951, which is supposed to fit this boat, for around $120.00. Thank you in advance.

 

[Bob_VT]

Re: Replace alternator? (automotive)

Marine are self contained to be used in a flammable environment where gasoline fumes may be lurking. I would get the right marine one for safety.

 

[Maclin]

Re: Replace alternator? (automotive)

Very important safety item in my opinion. And some boats have to have the alternator specific to their wiring scheme. I think yours is not as sensitive to that but other brands and configurations are and need the "extra wires" for their spec.

 

[scutly]

Re: Replace alternator? (automotive)

get a marine one for reasons already listed. under $90 shipped

http://cgi.ebay.com/ebaymotors/NEW-...ptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

 

[haulnazz15]

Re: Replace alternator? (automotive)

Yup, open sparks from that alternator will be happy to ignite the gas fumes in the bilge. Get a marine approved unit ASAP.

 

[UNSUREBOATGUY]

Re: Replace alternator? (automotive)

Thanks, guys. I'll be sure to get one before spring. That's what I though you would say. Is there any concern with a higher output unit? I'm pretty sure the one that came with the boat was 55 amp, the one on it now is a 61 amp (?) unit. The one in the ebay link is listed at 105 amps. Anyone know the quality of the alternator in the ebay link?

 

[UNSUREBOATGUY]

Re: Replace alternator? (automotive)

Thanks again for the input.

 

[Don S]

Re: Replace alternator? (automotive)

In a small boat (about 24-26'), a 55 to 65 amp alternators are standard, 105 is way more than needed for a 16' boat with a single battery, and ebay may not be your best coice for finding an alternator.

 

[UNSUREBOATGUY]

Re: Replace alternator? (automotive)

Thanks Don, and everyone else. For a guy who is just learning about I/O boats, this forum is a huge help!