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Alt to starter connection

 
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Beemer



Joined: 26 Aug 2006
Posts: 87
Location: Middle Georgia

PostPosted: Tue Nov 04, 2008 2:19 pm    Post subject: Alt to starter connection Reply with quote

Sorry if this has been covered, but I can't find it anywhere.

First, I'm using a NipponDenso IR alternator of 55amps, and a Bosch starter from the car the engine came from. I am not planning on using a separate starter contactor.

On my install, it would be very convenient to run the power lead from the big starter post to the alternator B-lead post, then 4AWG back to the battery.

Is it harmful to run the starter voltage through the alternator this way when cranking the engine?

Thanks,


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KF2 (and now an M3!)
Suzuki G10 three-banger
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PostPosted: Thu Nov 06, 2008 7:20 am    Post subject: Alt to starter connection Reply with quote

At 02:19 PM 11/4/2008 -0800, you wrote:
Quote:


Sorry if this has been covered, but I can't find it anywhere.

First, I'm using a NipponDenso IR alternator of 55amps, and a Bosch
starter from the car the engine came from. I am not planning on using a
separate starter contactor.

On my install, it would be very convenient to run the power lead from the
big starter post to the alternator B-lead post, then 4AWG back to the battery.

That works. It's been done on lots of Lycoming
installations where the alternator and starter are
in close proximity.

How long is the wire from your alternator b-terminal
and the starter fat-wire terminal?

Quote:
Is it harmful to run the starter voltage through the alternator this way
when cranking the engine?

No, what you've proposed is electrically no different
than other architectures published. In most installations
the b-lead is generally connected to the bus all the time.
You're only re-arranging the mechanics of the same
connections.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------


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Beemer



Joined: 26 Aug 2006
Posts: 87
Location: Middle Georgia

PostPosted: Thu Nov 06, 2008 2:33 pm    Post subject: Alt to starter connection Reply with quote

Thank you. I suspected it to be as you said, but I wanted to make sure
before I blow up an otherwise working alternator.

The distance from the starter to alternator big leads is about 12 inches. It
will only save a few ounces, but I need all I can from up there, plus it
makes a slightly simpler installation. Simple is good.

Bradley

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KF2 (and now an M3!)
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Middle Georgia
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PostPosted: Fri Nov 07, 2008 5:20 am    Post subject: Alt to starter connection Reply with quote

At 05:32 PM 11/6/2008 -0500, you wrote:
Quote:


Thank you. I suspected it to be as you said, but I wanted to make sure
before I blow up an otherwise working alternator.

The distance from the starter to alternator big leads is about 12 inches. It
will only save a few ounces, but I need all I can from up there, plus it
makes a slightly simpler installation. Simple is good.

It is not be necessary to "worry about blowing up
and otherwise good working alternator." Like aviation
with a combination of SAE, RTCA, MIL-Specs, FARs, ISO,
etc. etc the automotive industry is no less motivated to craft
a product that shrugs off anything a system and most
things that an installer throws at it.

Aside from lack of cooling and flimsy installation with
respect to vibration, there's nothing the OBAM aircraft
installer should concern themselves with . . . especially
nuances in wiring. These are NOT hand-painted china cups
that will crumble in the hands of the uninitiated user.

I mentioned a few weeks ago that I was privileged to
get a huge data dump and first-hand look at an
alternator refurbishment operation. That trip rebutted
many of the popularly endorsed ideas about how
alternators work and how they should be treated
to protect the owner's return on investment. I'm
working on an article that will share all I have
learned. In the mean time, know that the shiny
electro-whizzy you pulled out of the box from
Smiley Jack's Purty Good Car Parts store is not
the fragile device looking for a pampering.

Bob . . .


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