[DeTomaso] 3 Wire ALT REWIRE Instructions/Help!?
Forest Goodhart
forestg at att.net
Mon Mar 28 00:25:52 EDT 2022
Steve,Attached is the most common wiring for the 3G alternator. If you want the most accurate sensing location I suggest the ammeter connection, load side but either will work. I sense at the battery connection on the alternator and it seems to work fine.Forest
On Sunday, March 27, 2022, 05:25:52 PM PDT, Steve Liebenow <steven.liebenow at att.net> wrote:
Hey all!
Ready to go about installing firewall bump reduction, and need some
help with prior alt wiring.
My 74 came to me with a late model Ford 3G(?) 3 wire alternator
installed, and a messed up glob of wires at the alt area on the rear of
the firewall behind the passenger seat. I "reduced the mess" to
acceptable but paid no heed to "what is correct". Presumed that it was
connected properly..... Car runs, battery charges, alt gauge
flutters sometimes...... I want to confirm that the load sensing is
being done properly.
Then I read an article which Mike D sent me from MAD enterprises with a
great explanation about why we want to use a 3 wire alt, (with onboard
regulator), vs a real life "1-wire" alternator which really is only
good for something like a tractor or a remote generator where there are
NO accessories.
The article explains remote sensing and how it is important to under
stand "where" to connect wires to that alternator is given a realistic
reading of "load". Typically this would be more of a common point in
the main feed harness that is some distance away from the alternator.
You could sense directly at the alternator, or even the battery, but
that isn't preferred either way.
So I looked at the wiring diagrams and see a junction #1 on SOBills
excellent adventure in electrical diagrams, but no idea exactly where
this is! The of course we have two distribution panels of sorts,
left of dash and right of dash. Who's on first!
SO, main alt out wire connects normally to large wire which heads off
somewhere.....fuse panels and ign switch. Remote sensing wire
connects to "a point far far away" (but not sure which lead this is on
my late model Ford 3G(?) alternator......and then there is one more
terminal that I have no idea what/where it goes.... perhaps an exciter
voltage to turn on alt?? That takes care of the three alt wires, but
that doesn't help with what appears to be an old 4th wire that feeds
the dash bulb indicator......
I believe that Hall sold this alt years back, but I found no paperwork
with it in the PO's records.... No idea who installed it
either.......so kinda stuck!
The GM type 3 wire alt is also lacking clear instructions, in the
instructions......so no help there with the reduction kit. ( Small
amount of work needed here.....) It really appears to have been
written early on for directly using original alternator.....but some
crossed wires with the late model application, which falls short of
calling out connections at all.
Anyone running 3G alt that can comment??????
Thanks in advance!
Steve
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Steve,
Attached is the most common wiring for the 3G alternator. If you want
the most accurate sensing location I suggest the ammeter connection,
load side but either will work. I sense at the battery connection on
the alternator and it seems to work fine.
Forest
On Sunday, March 27, 2022, 05:25:52 PM PDT, Steve Liebenow
<steven.liebenow at att.net> wrote:
Hey all!
Ready to go about installing firewall bump reduction, and need some
help with prior alt wiring.
My 74 came to me with a late model Ford 3G(?) 3 wire alternator
installed, and a messed up glob of wires at the alt area on the rear
of
the firewall behind the passenger seat. I "reduced the mess" to
acceptable but paid no heed to "what is correct". Presumed that it
was
connected properly..... Car runs, battery charges, alt gauge
flutters sometimes...... I want to confirm that the load sensing is
being done properly.
Then I read an article which Mike D sent me from MAD enterprises with
a
great explanation about why we want to use a 3 wire alt, (with
onboard
regulator), vs a real life "1-wire" alternator which really is only
good for something like a tractor or a remote generator where there
are
NO accessories.
The article explains remote sensing and how it is important to under
stand "where" to connect wires to that alternator is given a
realistic
reading of "load". Typically this would be more of a common point in
the main feed harness that is some distance away from the alternator.
You could sense directly at the alternator, or even the battery, but
that isn't preferred either way.
So I looked at the wiring diagrams and see a junction #1 on SOBills
excellent adventure in electrical diagrams, but no idea exactly where
this is! The of course we have two distribution panels of sorts,
left of dash and right of dash. Who's on first!
SO, main alt out wire connects normally to large wire which heads off
somewhere.....fuse panels and ign switch. Remote sensing wire
connects to "a point far far away" (but not sure which lead this is
on
my late model Ford 3G(?) alternator......and then there is one more
terminal that I have no idea what/where it goes.... perhaps an
exciter
voltage to turn on alt?? That takes care of the three alt wires,
but
that doesn't help with what appears to be an old 4th wire that feeds
the dash bulb indicator......
I believe that Hall sold this alt years back, but I found no
paperwork
with it in the PO's records.... No idea who installed it
either.......so kinda stuck!
The GM type 3 wire alt is also lacking clear instructions, in the
instructions......so no help there with the reduction kit. ( Small
amount of work needed here.....) It really appears to have been
written early on for directly using original alternator.....but some
crossed wires with the late model application, which falls short of
calling out connections at all.
Anyone running 3G alt that can comment??????
Thanks in advance!
Steve
_______________________________________________
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Posted emails must not exceed 1.5 Megabytes
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