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  Yamaha 90 hp Recharge of Battery

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Author Topic:   Yamaha 90 hp Recharge of Battery
Irishbob posted 08-21-2003 11:13 AM ET (US)   Profile for Irishbob   Send Email to Irishbob  
Hi
I have a Montauk with a 1994 Yamaha 90hp.
Ocassionally when starting it does not seem to have enough puff tt turn engine to start. Is the battery re charging when engine running ?
This has happened to me even after running for hour or two.
Do I need a new battery ?
Is it more likely a loose connection.
If so what should I check.
Thanks,
Irishbob
VincentG posted 08-21-2003 12:33 PM ET (US)     Profile for VincentG  Send Email to VincentG     
The first thing I would check is corrosion on the battery connections.
Bigshot posted 08-21-2003 12:59 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
2nd if battery is more than 1.5 years old, replace it.
whalerajm posted 08-21-2003 10:52 PM ET (US)     Profile for whalerajm  Send Email to whalerajm     
I concur with earlier posts...first check battery connection then check your battery...How long does it last after a full charge?...How many starts are you getting before it craps out?

If battery and connections are good, check out regulator in engine...

I'm not a mechanic or electrician, but I have been told that with my 90 HP Evinrude, unless you are turning 2500-3000 rpm, battery isn't getting much of a charge, even if you are running 1-2 hours.

Sal DiMercurio posted 08-22-2003 12:38 AM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
By any chance, is your tach working ?
If not, your rectifier is shot.
A sure way to blow the rectifier is to use wing nuts on the battery, thats a no no, throw the wing nuts away as far as you can & put 2 s/s nuts on each terminal to hold the cables "TIGHT", reason, if one or both cables becomes even a little loose, you can kiss your rectifier by by.
It's true if you have an older Evinrude that it only puts out about 6 amps until you run around 4,000 rpms, then it beguins to charge but the new Evinrudes put out 35 amps even at idle.
The charing systems on the older engines were not made to charge a battery, just to maintain a full charge providing the battery already has a full charge.
Sal
kingfish posted 08-22-2003 09:11 AM ET (US)     Profile for kingfish  Send Email to kingfish     
Sal-

What approximate year separates "older" from "newer" Evinrudes in regards charging at idle??

John

Sal DiMercurio posted 08-22-2003 10:29 AM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
I think it's when the Evinrudes went to FICHT in 96.
Sal
Bigshot posted 08-22-2003 11:16 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Actually that depends on the engine. Any V4 or V6 looper will have a decent charging system. The old crossflows did not. If you have a round silver thingy on the side of your block mounted on a triangle, you have the old system. If you have a terminal block on top of the engine between the cyl banks that is recessed under a cover, you have the newer water cooled system. Newer engines actually have a car type alternator that runs off a belt, most powerful.

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