alternator conversion kit

steveoh2222

Cadet
Joined
Jul 25, 2004
Messages
11
Does anyony know of a reputable company that sells a good alternator conversion kit for a 1986 170 merc.? My voltage reg. is burnt again and I want to avoid replacing it forever.<br /><br />Thanks.
 

WillyBWright

Fleet Admiral
Joined
Dec 29, 2003
Messages
8,200
Re: alternator conversion kit

Don't know if one is offered, probably no room under the hood. Just get yourself another regulator and make sure it's grounded well and that the battery connections are clean and tight. Most regulator failures occur because people neglect their batteries and before you know it the posts are covered with green. Another major cause is wing nuts. Finger-tight is not enough! You gotta crank them down with a pliers. If yours is an EFI, make sure the battery is of the proper capacity for your motor. An el-cheapo wimpy-duty battery isn't going to cut it. You need healthy Heavy Duty or Extra Heavy Duty battery. Settling for the cheapest battery will cost you far more in the long run. Make sure it isn't old either. Two years is all you should expect out of a marine battery. Push it much farther than that and you're asking for problems. Other causes for regulator failures are connecting the battery backwards, even only for a second. And battery switches switched with the motor running. That's a big no-no.<br /><br />So in other words, the vast majority of regulator failures have nothing whatsoever to do with the regulator. Look elsewhere and correct the problem(s) before you waste your money on a new one. Even if alternators were available, they'd fail just as fast if any of these turn out to be the problem. Take heed and pay close attention to these causes and you should never have to buy another regulator again.
 

steveoh2222

Cadet
Joined
Jul 25, 2004
Messages
11
Re: alternator conversion kit

Thanks for the info. I have read a lot about this particular motor and one major problem is this water cooled regulator. I bought this boat from a dealer who said that it was just replaced a couple of years ago. I know the connections on the battery are good and clean as well as tight. Its got plenty of juice as well. However, I don't know for sure what condition the connection was on the regulator. A new reg. is going to cost me about $250.00. Is there any other things besides a good ground that I should check before I fire it up with a new reg.? I would hate to fry another one.<br /><br />Thanks!
 

WillyBWright

Fleet Admiral
Joined
Dec 29, 2003
Messages
8,200
Re: alternator conversion kit

Yeah. One biggie I forgot to mention. Where the negative cable meets the block. Most are attached to a lower starter mount bolt. That means the power has to travel thru the bolt into the block. That isn't good enough. Try to find a logical place to mount it directly to the block and clean the paint off of that spot so the electricity doesn't have to rely on a bolt and threads that often corrode. Adding a jumper ground straight from there to the regulator ground would also be a good idea. I find that the more direct the electrical route is, the more reliable it is.
 

ronmold

Petty Officer 1st Class
Joined
Sep 8, 2003
Messages
240
Re: alternator conversion kit

Do you have a 175 V6? I've not seen a 170. I have a '86 175 and did convert the regulator / rectifier with great results.
 

steveoh2222

Cadet
Joined
Jul 25, 2004
Messages
11
Re: alternator conversion kit

DasBoot,<br />I have a 4cyl. 224 cu in. mercruiser 170 I/O (similar to merc. 470). <br /><br />WillyB,<br />Thanks again! I will work on it and try to locate a bad ground. Then add a ground wire as suggested.
 
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