[E-Type] Alternator swap from Lucas to Delco

I have searched the Forums and am lokking for help. I pulled off my
Lucas Alternator from my 1966 E Type. I am putting on a 7127 Delco
Alternator with an internal regulator. I drilled out the original
double grooved pulley and installed it on the Delco. I need to know
should I hook up the old wire to thatcomes on with power from the
key or jump a wire from the main batterry sharging lead to the
field terminal? And which one is the field terminal on the Delco-
#1 or #2? Also where is the wire to attach to the alternator as a
signal to turn out the ignition light? or should I just take out
the ignition light bulb? I am leaving out the original lucas
regulator and don’t know which wires to leave disconnected or
jumped. I had previosly installed a Hitachi Alternator but had
hooked something up wrong and it just overchareed to 16 volts +. So
I am now trying the Delco. Any help out there? I don’t want to
spend $400.00 for the Delco kit from XKE’s Unlimited! Thanks Ken–
ktucker8
Folsom/Ca, United States
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In reply to a message from ktucker8 sent Mon 5 Jun 2006:

Can’t help with the wiring, but don’t worry about the
ignition light; it’s not connected to the alternator. It’s
controlled by the oil pressure.–
The original message included these comments:

#1 or #2? Also where is the wire to attach to the alternator as a
signal to turn out the ignition light? or should I just take out
the ignition light bulb? I am leaving out the original lucas


Jack Terrick 66 FHC
Greensburg, PA, United States
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In reply to a message from Jack T. sent Tue 6 Jun 2006:

I found the oil pressure switch at the oil filter but the light
stays on even with the engine running. It always went out with the
Lucas Alternator in place.–
ktucker8
Folsom/Ca, United States
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You don’t have a field terminal, as you had on the Lucas, because
it’s internally regulated. Instead, you have an indicator (1) and
battery sense (2) connection, as well as a B+ battery connection.

Your car probably has an oil pressure switch which operates the
dashboard light. If this is the case, you need not change that. OTH,
you may have the later system, which used a 3AW relay mounted under
the heater box. Here are instructions either way:

  1. If you have an oil pressure operated dash light. Find your 12V+
    field wire at the alternator end. Install a 330 ohm resistor (from
    radio shack) in line with this lead, and attach it to the #1
    connection on your alternator. Tape off the 12V- lead.

  2. If you have a 3AW. Locate the WL lead on the 3AW. Extend this to
    the #1 connection on your alternator. It’s a good idea to solder a
    330 ohm resistor in parallel with the dash light (so that your
    alternator can work, even if the bulb blows). This would require
    getting behind your dash, so we’ll make it optional. Tape off both
    field leads at the alternator.

In either situation, the big B+ wire should connect to the B+ stud on
the alternator. If the alternator puts out more current than the
original, this big wire should be replaced. Alternatively, you can
run a second wire in parallel. You should wire the #2 lead to the B+ stud.

That’s about it. As long as you’ve worked out the pulley, fan, and
mount, you’re ready to go.

Mike Frnak

At 02:53 PM 6/5/2006, you wrote:

I have searched the Forums and am lokking for help. I pulled off my
Lucas Alternator from my 1966 E Type. I am putting on a 7127 Delco
Alternator with an internal regulator. I drilled out the original
double grooved pulley and installed it on the Delco. I need to know
should I hook up the old wire to thatcomes on with power from the
key or jump a wire from the main batterry sharging lead to the
field terminal? And which one is the field terminal on the Delco-
#1 or #2?

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In reply to a message from ktucker8 sent Mon 5 Jun 2006:

Ken - there are a couple of us listers in your area, not sure
if any of us have ever made your acquaintance, including David
Shield and Tom Pope in El Dorado Hills and me, I live in
Auburn. Glad to see there is another one of us locally–
Kevin Kemper
Auburn, CA, United States
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Jack,
That depends on the car, many are connected (indirectly) to the alternator. Alas the schematic for the S1 4.2L cars show both scenarios but the cars have only one or the other. Earlier cars have the pressure sw. later have the 3AW/alternator connection.
pauls 67ots

In reply to a message from ktucker8 sent Mon 5 Jun 2006:

Can’t help with the wiring, but don’t worry about the
ignition light; it’s not connected to the alternator. It’s
controlled by the oil pressure.
<<<<<<<<<<

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Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.phpFrom: “Jack T.” jht66e@comcast.net
Subject: Re: [E-Type] Alternator swap from Lucas to Delco

In reply to a message from Kevin Kemper sent Tue 6 Jun 2006:

Pleasure to meet you. I am usually commuting up and down Highway 50
from Folsom to Downtown Sac in my Jag. At least for now- I don’t
know how it will act with 100 degrees out.–
ktucker8
Folsom/Ca, United States
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In reply to a message from Michael Frank sent Tue 6 Jun 2006:

I got it! Thanks! I took out the 4 bolts on the Delco and rotatated
the stator housing 180 degrees. Then mounted the Delco on my 4.2
stock bracket. Perfect fit!I had bought a factory wire plug in from
Kragens to plug into the Delco Alternator. # 2 {which is the red
wire from my Kragen plug in loom }on the Delco I hooked up to
ignition hot lead with ignition switch on from my old Lucas wiring
Loom.# 1 Lead ( white wire from Kragen Autos plug in for the Delco}
I attached the lead going to that 3AW you told me about.Charging
great!!! And the ignition light goes out like it should!!!
Conversion worked out great. I drove it to work 70 miles round trip
today and no problem!My 66 is on the road again! Thanks for the
feedback!Ken–
ktucker8
Folsom/Ca, United States
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