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07-13-2008, 09:40 PM
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#1
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1 Rivet Member
Bloomington
, Minnesota
Join Date: Jun 2007
Posts: 19
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My Alternator is connected to... This?
My understanding is that my 12si alternator has an internal regulator.
So, what the heck is this thing?
It is mounted on the alternator bracket.
Any info on connectivity appreciated!
Pic's attached.
Thanks!
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07-13-2008, 10:36 PM
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#2
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4 Rivet Member
1975 23' Safari
Portland
, Oregon
Join Date: Jun 2008
Posts: 305
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drfw--
Are you sure it's a Delco 12si (or clone)? I've seen a lot of them, clocked all different ways... but never with that connector.
__________________
Thanks,
Ron
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07-13-2008, 10:57 PM
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#3
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My Grandparents Airstream
2007 28' Safari SE
Hillsboro
, Texas
Join Date: Dec 2002
Posts: 174
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That is the blower relay. It has nothing to do with alternator . It might be mounted by or near the alternator . I have replace many over the years working on cars and trucks.
__________________
Andrew Selking
WBCCI #6062
International 3rd Vice President
"Airstream the Best trailer ever built."
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07-13-2008, 11:18 PM
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#4
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Rivet Master
1984 31' Airstream310
Dunsmuir
, California
Join Date: May 2004
Posts: 1,336
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I have one of those which is actually my starter relay.
__________________
If you want others to be happy, practice compassion.
If you want to be happy, practice compassion - The Dalai Lama
1984 310 Limited Motorhome
Courtesy Parking (W/S/E/Wi-Fi) on I-5 in Northern California, 70 miles from Oregon border
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07-14-2008, 06:00 AM
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#5
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Retired.
Currently Looking...
.
, At Large
Join Date: Jun 2003
Posts: 21,276
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It is a multipurpose relay. In this case, it could engage when you energize it, and route some of the alternator's output to the house batteries. If used in that manner, it would be a crude, but effective, isoltion switch.
__________________
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
Terry
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07-14-2008, 10:01 AM
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#6
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1 Rivet Member
Bloomington
, Minnesota
Join Date: Jun 2007
Posts: 19
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I did a bit of wire tracing.
Looks like she goes to the starter among other things.
must be a starter relay.
how does it work?
IE:
alternator/Batt parallel connected as big juice to output when triggered?
ignition switch start postion juice as input trigger?
Big juice output to starter solenoid?
There is a fourth wire that may go to the coil or something.
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07-14-2008, 04:50 PM
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#7
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1 Rivet Member
Bloomington
, Minnesota
Join Date: Jun 2007
Posts: 19
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OK
I believe I have the answer.
This relay is known in the biz as a "hot start" relay.
They are commonly used in GM starter applications to feed a nice big flow of current to the (super hungry when hot) solenoid/starter.
please find connectivity explanation link below.
http://www.type2.com/bartnik/images/relay.gif
Lots of cats are using the old ford type bypass solenoids to fix the hot start issue.
Please see the link below.
(It's a link to an online catalog, but it has a well written explanation for the application.)
Catalog
Best to all of you.
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07-14-2008, 11:07 PM
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#8
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4 Rivet Member
1975 23' Safari
Portland
, Oregon
Join Date: Jun 2008
Posts: 305
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drfw--
Glad to hear to worked out.
__________________
Thanks,
Ron
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07-15-2008, 07:10 AM
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#9
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1 Rivet Member
Bloomington
, Minnesota
Join Date: Jun 2007
Posts: 19
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Please note:
Airstream originally wired the genny's 12v feed directly to the engine starter.
Unfortunately, using the old ford type bypass solenoid as a hot start fix will kill 12v power to your genny, unless you rewire the genny 12v feed to somewhere other than the starter.
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