High Volage

[wickie]

Good Afternoon, people. My name is Rick, and I just joined. I have a '71 Capital Boat, 16' speed boat with a 115 merc (#6129026), the problem I'm having is when I get up to speed, the voltage at the battery climbs to 16v, I had it in the shop, and they replaced both switch boxes and re-sync it. They tell me the stator, and rectifier tested o.k., but it still climbed to 16v. I really can't afford to have them replacing anymore parts, only to not have the problem fixed.Any suggestions would be great.

 

[Laddies]

Re: High Volage

High voltage id a common problem, normal is caused by a ad connection, a bad with to little of capacity or cell going bad but in some cases the rectifier has to be replaced with a regulator to keep the voltage down. As you know now the dealer sold you 2 boxes that you did not need nd is planning on selling you a stator and god only knows what elses. Either check the connections and battery or install the regulator your self or find a differant dealer.

 

[wickie]

Re: High Volage

Thanks Laddies for the return post, the battery is brand new, and I was told these motors are unregulated (no reg). I did notice a stator wire ( at the base of it ) was "chipped" ( one of the yellows, appears to have heated up and dis colored) This happed before near the rectifier, But I repaired it. I get continuity between the two yellows, so I know it's not completely broke.If there's a regulator, I don't know where it is, the manuals I have don't show.

 

[Laddies]

Re: High Volage

The engine was never factory equipped with a regulator you need to back fit one from a newer engine like this one, it will require a additional wire for the voltage sensor and the tack lead comes off the regulator instead of the rectifier stud as it does now but both are simple changes. If you get a discount at a NAPA store the part number is the same.
http://www.iboats.com/mall/partfind...gd_poid=111805&gd_row=16&**********=544000836

 

[wickie]

Re: High Volage

Thanks again, I hope I'm not being a pest, but what about the burnt stator wire?, I mean why put a reg on if it never needed one in the first place? and how hard is it to install? ( does it come with a wire diagram?) again thanks for all your help, I'm not the brightest one around when it comes to 2-strokes

 

[Laddies]

Re: High Volage

Usually a loose connection burns the wire. Then reason to install one is you don't want it overcharging, if you don't care leave it alone it won't hurt the engine or battery as long as the battery is kept full. The only thing it might hurt is voltage sensitive accessories. If you can't live with it that way the cheapest way out is a regulator you have already spent many more dollars than the right fix would have cost in the first place if you bought 2 boxes which have absolutely nothing to do with the charging system.

 

[wickie]

Re: High Volage

The over voltage was one of two issues, they told me that 2 cyls were not fireing at times due to a bad switch box ( that's what they told me). The engine was hard to start cold, and would bog down when accelerated. Do you think if I replace the burnt section of wire would work, with the reg?

 

[emckelvy]

Re: High Volage

Wickie, retrofitting a rectifier/regulator assy is a good solution to your problem.

Merc never did put a regulator on their Inlines or any of the 'older' generation of 4-cyl's. They were pretty "low-tech", with about 10 amps or so of charging capacity. All they were really intended to do was to charge the battery after a startup, and maybe run a few lights, etc. Guess they figured most folks would start and stop enough that the voltage rise wouldn't matter.

Nowadays there are a lot of sensitive elex eqpt that didn't exist in the Days of Yore, old E.C.K. (Karl Kiekhaefer) didn't have to worry about that stuff!

One very low-tech solution to your problem would be to turn on the running lights. This may put just enough load on the system that voltage won't build up to a distressingly-high level.

If that doesn't do the trick, the reg/rect will. Note that in this case the regulator cannot increase power beyond the max output of the 6-cyl's alternator, it can only 'clamp' max voltage to a predetermined value (probably somewhere in the range of 13.5-15V).

HTH & G'luck with the charging issue.........ed

 

[wickie]

Re: High Volage

You guys are great! So you don't think I need to replace the stator? ( just repair the wire) I feel like a little school kid with all these questions:redface:
BTW, I'm not running any accessories, except the trim motor. I have one light, and a radio I never use.
Plus, can somebody tell me how to wire a reg into it, I noticed it has 5 wires, and my rectefier has 4. thanks again guys!

 

[Laddies]

Re: High Volage

Here's a wiring diagram for a 4 cyl so you can see how the regulator is hooked up, it's the same on your motor just easier than the 71 115HP to read, you may or may not have the tach wire hooked up on your system as shown but if it is it willl be a brown wire that comes off a terminal with a yellow wire on it if there is none just tape the grey regulator wire off.

 

[wickie]

Re: High Volage

Thanks again, you guys are lifesavers

 

[emckelvy]

Re: High Volage

Just a thought, a "regulator-only" vice rectifier/regulator would also work.

If your rectifier is working properly this is all you really need.

Cheap at ebay prices:

http://cgi.ebay.com/ebaymotors/Merc...ryZ50439QQssPageNameZWDVWQQrdZ1QQcmdZViewItem