[DeTomaso] DeTomaso Digest, Vol 71, Issue 21

John Buckman jb841 at cox.net
Mon Jun 21 13:00:36 EDT 2010


Michael,

Yes, that would be another good (and relatively easy) way to go.

The one negative (no pun intended) aspect of feeding from a switched 12v source is that if the ignition switch were to be placed in the "run" position (engine not running) for some testing or troubleshooting, then the choke (and the coil) would receive power while the testing/troubleshooting was being performed.  While this won't adversely affect the choke, it would be an additional current drain on the battery while testing is being done.  The fuse for the relay could also be pulled during extensive testing.

With the stator connection, the choke would only receive power when the engine was running and, of course, the alternator would have to be functioning properly.  Ford used the stator connection for a few years.

This brings up another interesting point.  If we have an alternator failure in our cars (other than losing a belt), then, with the stator connection for the choke, we wouldn't be able to drive the car very far before the choke would close and the engine air fuel ratio would become excessively rich and the engine would die.  Of course, driving the car any distance with an alternator failure should only be done with relatively cool air temps so that the use of the cooling fans would not be required, or at least minimal useage.

Using the stator connection certainly is the less expensive (and faster) method, requiring only a short length of wire, two (different) crimp connectors, and possibly a #10-24 nut (verify the size and pitch before purchasing the nut, as this stud size can change with vendors), whereas the relay method will require more parts and time.

An additional note if connecting to the stator terminal:  If there is only one nut on the stud, do not remove that nut.  Add a second nut.

An advantage of using a relay for the ignition (especially with an aftermarket ignition system) is that the electrical load (current) for the ignition is transferred from the ignition switch and wiring directly to the relay contacts.  This helps to prolong the life of the ignition switch and will, in most cases, ensure a more stable (and possibly slightly higher) voltage to the ignition system.

As always, YMMV.

John   



On Jun 21, 2010, at 8:41 AM, Mikael wrote:

> 
> 
> Well, how about a relay working on the ignition wire, and with + straight
> from the battery (with a fuse inline). Would that not give me enough
> juice to both feed the choke and the resistor, so the choke gets 12V and
> the coil (after the resistor) 9V?
> 
> 
> Mikael
> www.tuningmadeeasy.com [http://www.tuningmadeeasy.com]
> 
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