100 Amp Alternator? 99 Air

[jaybird]

RE: Re: RE: 100 Amp Alternator? 99 Air

Hey Chexi,

Mikeski is right, an automotive alternator on a boat is not as big a deal as some make it out to be. Should you do it? No. Will it hurt the boat? No. It works exactly the same as a marine alternator, the only differance is that a marine is "ignition protected" it is manufacture in a manner that prevents or greatly reduces the chance of producing a spark that may result in the ignition of fumes. I would change it but you were only in danger if you had a gas leaks or build up of fumes. It will not burn up or cause you any probelms unless it was connected to old 50 amps wiring.

[Chexi]

RE: Re: RE: 100 Amp Alternator? 99 Air

Anyone know what this hole is for? Is this a speaker hole? My interior just had vinyl over that hole with "Correct Craft" embroidered there. I was thinking about adding 1 or 2 speakers to the front area. Were there other 99 nautiques that came with a single speaker in the nose?

[jaybird]

Hole

I don,t know but my 226 has the same hole. If I had to guess I would say a wrench access to the lifting eye bolt/nut.

[wake_fun]

RE: Hole

That's what I'd say also.

[JUST-IN-TIME]

Re: RE: 100 Amp Alternator? 99 Air

you need to hook an amp meter and find out

Your kidding, right? Tell him the rest of the procedure.

Well amp meter connected to outpost pole of alt
then you need a load on the battery to induce amperage

also never run an ammeter on a boat also, it is not ignition prodected

[Mikeski]

RE: Re: RE: 100 Amp Alternator? 99 Air

Just-in-time,

That will not tell you much about the alternator capacity, only what it is currently putting out, rarely are they even close.

Permanent ammeter is fine on a boat. Not ignition protected? An ammeter is simply a very sensitive voltmeter that measures the voltage drop across a calibrated voltage shunt, no switching - no sparking, no source of ignition. Ammeters are used frequently on boats.

In your test, are you using a clamp on?

What is the basis of your electrical knowledge? I have seen you provide some very good advice but I find this suggestion to be peculiar.

[JUST-IN-TIME]

RE: Re: RE: 100 Amp Alternator? 99 Air

yes clamp on, or you can use a vom
you need to put a load on the battery to make the alternator work
yes you will not get 100 amps out of 100amp alt, but it will be more than 65 amps

read USGC regs on electrical components and come back to me on this answer

[Mikeski]

Re: RE: Re: RE: 100 Amp Alternator? 99 Air

Just-in-time,

VOM to measure more than 65amps of current? No way (at least not without a shunt circuit involved), VOMs max out around 10-15 amps, you are going to be replacing an internal fuse on the meter.

Show me where you think it says not to use an ammeter in the USCG regs. You must be mis-interpreting something.

No problems with ammeters on boats, just google marine ammeter. If you understood the innerworkings of an ammeter you would realize the only difference between an ammeter and voltmeter is the range of voltage.

[JUST-IN-TIME]

RE: Re: RE: Re: RE: 100 Amp Alternator? 99 Air

183.405 General

most guys just put it in anywhere
the reason not to use them is because most will sell you an automotive one and call it a marine one

We learned that in ABYC electrical school, told us to stay away from installing them

Some VOM's will handle over 100 amps, FLUKE makes one

[AirTool]

Re: RE: Re: RE: Re: RE: 100 Amp Alternator? 99 Air

183.405 General

I'm not seeing it:

http://ecfr.gpoaccess.gov/cgi/t/text...dno=33;cc=ecfr

[Mikeski]

RE: Re: RE: Re: RE: Re: RE: 100 Amp Alternator? 99 Air

Show me a VOM that measures 100 amps (non-clamp on) Fluke or otherwise, doesn't exist. Simply speaking, the test leads and internal wiring required would be prohibitive to manufacture. The device you may be thinking of is a load bank?

§ 183.405 General.
Each electrical component on a boat
to which this subpart applies must
meet the requirements of this subpart
unless the component is part of an outboard
engine or part of portable equipment.

I don't see it there either, fire that instructor.

Check section 111.30–27, an ammeter is REQUIRED whenever a generator is on board, next time you are on a houseboat you will see it.

The only difference between the gauge part of a Voltmeter or Ammeter is the range of voltage being measured, display and bi-directional range on the ammeter, it is still measuring voltage, just the millivolt gain or drop across the shunt instead of source voltage.

sorry for the detour this thread has taken, I guess we have too much pent up winter weather frustration, so we just beat up on each other instead of going skiing.

[AirTool]

Re: RE: Re: RE: Re: RE: Re: RE: 100 Amp Alternator? 99 Air

sorry for the detour this thread has taken, ....

I apologize too. I don't like most of just-in-time's post and I just couldn't resist on this one.

you need to hook an amp meter and find out

Your kidding, right? Tell him the rest of the procedure.

Again....please forgive me.

[Chexi]

RE: Re: RE: Re: RE: Re: RE: Re: RE: 100 Amp Alternator? 99 A

What is life without a little spice?