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  Small Fords and Mercurys
  12v source

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Author Topic:   12v source
3154tm
Journeyman

Posts: 37
From: Pensacola, Fl
Registered: Feb 2006

posted 07-19-2006 02:17 PM     Click Here to See the Profile for 3154tm        Reply w/Quote
i've searched the archives and didn't find a definitive answere. i can't seem to find a good source for 12v with the ignition switch in the on position for the msd box and the electric choke. i used the old lead for the coil which isn't used w/ the msd ignition. it shows 12v w/ the ignition on. but as soon as the motor tries to start this circuit looses power. '65 ranchero, v8
any suggestions. thanks.
frank

69maverick
Moderator

Posts: 1539
From: Thomaston,CT.
Registered: Jan 2001

posted 07-21-2006 11:32 PM     Click Here to See the Profile for 69maverick        Reply w/Quote
If I remember right your are suppose to run a Fused power lead directely from the battery to the MSD Box. The Wire that used to go to the coil now goes to the Smaller wire on the MSD Box.

[This message has been edited by 69maverick (edited 07-21-2006).]

KULTULZ
Gearhead

Posts: 959
From: Rockville, MD
Registered: Oct 2002

posted 07-22-2006 05:50 AM     Click Here to See the Profile for KULTULZ        Reply w/Quote
quote:
Originally posted by 3154tm:


...i can't seem to find a good source for 12v with the ignition switch in the on position for the msd box and the electric choke. i used the old lead for the coil which isn't used w/ the msd ignition. it shows 12v w/ the ignition on. but as soon as the motor tries to start this circuit looses power.


In addition to the above suggestion;

The lead you are connecting to is 12V for start and then a resistor cuts the voltage back to 9V to not burn the old mechanical points (is this lead coming from the IGN SW or the starter relay?). You need to bypass whatever resistor design that circuit has or find a constant key sourced 12V off the ignition switch.

You need to be able to cutoff the circuit completely when not running (maybe even using a remote relay off the IGN SW to use full battery voltage to the ignition box if they call for a full voltage hookup).

You will want to run the electric choke coil off the STA (stator) of the alternator. It needs to be separate as to not interfere with the ignition box draw.


------------------
Am Looking For Factory/Aftermarket Speed Parts For The MEL (MERC-EDSEL-LINC-TBIRD) Engine Family (383-410-430-462) Produced From 1958 To 1968

Also Early FORD Special Service Tools

-Mercury-Edsel-Lincoln- Forum-

[This message has been edited by KULTULZ (edited 07-22-2006).]

69maverick
Moderator

Posts: 1539
From: Thomaston,CT.
Registered: Jan 2001

posted 07-23-2006 08:44 AM     Click Here to See the Profile for 69maverick        Reply w/Quote
KULTULZ :" You need to bypass whatever resistor design that circuit has or find a constant key sourced 12V off the ignition switch." Are you sure of this? I am pretty sure the MSD Box only looks at this connection as a signal not as the power source? I did not bypass mine and it has worked very well. I am running a Crain HI-6
but the hookup is the same. You Are right as to the power reduction so it is not a good source for the choke. One of the heavier guage wires from the fuse panel I think an orange wire? is a none reducted keyed power source in my Maverick.

KULTULZ
Gearhead

Posts: 959
From: Rockville, MD
Registered: Oct 2002

posted 07-24-2006 02:03 AM     Click Here to See the Profile for KULTULZ        Reply w/Quote
quote:
Originally posted by 69maverick:

KULTULZ :" You need to bypass whatever resistor design that circuit has or find a constant key sourced 12V off the ignition switch."

Are you sure of this?


At my age I am not sure of anything...

I assume the box has to have a constant BAT VOL hookup (min 12V). If he is sourcing this through the coil feed, it drops to 9V after a brief warmup, correct? I am just suggesting he find a KEY SOURCED battery voltage lead off the switch to power the box.

The choke should come of the STA terminal so as there will be no current draw with the engine off (accessories on).

Do I have this theory correct?

69maverick
Moderator

Posts: 1539
From: Thomaston,CT.
Registered: Jan 2001

posted 07-24-2006 11:13 PM     Click Here to See the Profile for 69maverick        Reply w/Quote
Yup You are right on the choke. As for the MSD Box I don't think it matters? I looked at a old set of install instructions for a 6-A box and it said to use the coil wire. They (MSD) must know about the voltage drop?
My guess is that it is just a signal the main power comes from the other source from the battery.

KULTULZ
Gearhead

Posts: 959
From: Rockville, MD
Registered: Oct 2002

posted 07-25-2006 02:01 AM     Click Here to See the Profile for KULTULZ        Reply w/Quote
I would think that they would want full BAT VOLT to power-up the box.

DURASPARK II has full voltage to its' module and then 12V/9V to the coil.

Go by the instructions by all means. I never could afford all of this store bought off the shelf race car parts...

------------------
Am Looking For Factory/Aftermarket Speed Parts For The MEL (MERC-EDSEL-LINC-TBIRD) Engine Family (383-410-430-462) Produced From 1958 To 1968

Also Early FORD Special Service Tools

-Mercury-Edsel-Lincoln- Forum-

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