New Starter Solenoids!

RL Chilton

Not too long ago, here on the forum, I read about the starter solenoids by NAPA/Echlin, part # ST79. These solenoids incorporate the remote starter button right on the solenoid, just like the original starter solenoids operated. Kicker is that these new solenoids are for 12V systems. I've installed one on the sedan and it works perfectly.

Not only does it operate like the original, it's my favorite brand, NAPA/Echlin, which I recommend for all your Hudson ignition needs, including Condenser, points, coil, starter solenoid, cap.

duncan

Does this starter solinoid being 12 V work with a 6 volt system Ray

[Deleted User]

Russell , you may be interested to know that Cole Hersee makes 6 & 12 volt steel cased solenoids currently. Check on part # 24039 6V 48-50 # 24041 6V for 51-54.. For 12 volt application: 24044 curved base foot . 24037 12 V flat base foot.

RL Chilton

Lance-
I'll look into that. Do you have contact information?

bartibog1

im running a 6v starter on 12 volts and had bought 3 of these type of solinoid and when I hooked them and used the button to operate the starter and I don't no if it was current draw with the 6 v starter or what the points in side burnt together leaving the starter engaged. thankfully the supplier took them all back. only way to stop the starter from turning was un hook battery. THIS IS ONLY A HEADS UP but maybe the NAPA one may be just fine.
Steve

RL Chilton

Steve-

For the record, were the solenoids you were using the Echlin brand?

nick s

Steve, current should be equal but speed doubled at 12 volts. Some of the sources may have a bad qc problem I did buy a 6V one a couple years ago that did not work from the key but did work from the button.

[Deleted User]

Russell, Not sure who sells Cole Hersee locally but a visit to their corporate website should tell you.

[Deleted User]

Steve, it also depends on what type of solenoid was purchased. There are intermittant duty and constant duty. Sounds like you got a constant duty solenoid which would not disengauge.

[Deleted User]

Nick , on an identical circuit 6 volt vs 12 volt the 12 volt current will be 50% less not equal.
Thats why 6volt system wires wre so much larger.
Roger

PAULARGETYPE

I'VE BEEN SELLING NEW 6 VOLT SOLENOIDS FOR THE PAST 4 YEARS I HAVE THEM IN 12 VOLT ALSO ALL NEW CAD PLATED YOU CAN GET A 12 VOLT UNIT WITH A BUTTON FROM THE PARTS HOUSES BUT IT'S BLACK BAKEALITE I HAVE THEM ALSO

nick s

Roger,to be identical, you would need a 12v starter.
that is true for a resistive load like lights, but with a motor(inductive load) speed is proportional to voltage and current is remains constant. we used this useful fact to test machines as we could run in slow motion and montitor current while observing the items that caused current changes. now if you were to propperly put in 12 v fields, the speed would match the 6v and current would be cut in half. now in some instances the load is speed dependent and on an item such as fan.

[Deleted User]

What I meant by the identical circuit was changing the power supply from 6 to 12 volts and changing nothing else,
Roger

nick s

if you take away the effect of any losses due to speed, the same motor will pull the same current regardless of voltage. try it on your work bench: take a starter, a 6v/12v battery charger and a current probe. run the motor at each voltage and check the current. they will be the same, tach the bendix and you will see that the speed is double. current is proportional to the required output torque. i.e. you are increasing horsepower but not torque.

I know when everything you know about dc systems says the current should be cut in half its tough to accept. it is much easier to swallow if you see it in practice.

[Deleted User]

12 Volt from NAPA

[Deleted User]

I don't know what kind of equipment you have worked on but low voltage causes high current draw on any circuit. Not realy a debateable thing.
Roger

DocHornet

Russell,

good find. The Brits, of course, had this figured out years ago. All my british car solenoids have a push-to-start button right on the solenoid.

I've been having sluggish hot starting (not starter motor, yes mine's a 6V starter powered by 12V so it cranks right over), and I swapped out my original 12V starter solenoid with an Echlin NAPA/Echlin ST-81. It has an extra terminal to bypass the ignition resistor during starting. Sends a full 12V to coil while starting vs the reduced voltage through the resistor. It does seem to help the hard starting issue.

nick s

Ok, I roger I invite you do do your own testing but here are a couple pics. my battery charger running a stepdown hydramatic starter at 6V and 12V. as crude as the meter on the charger is, 6v actually pulled 5-10 amps less than 12v. with an actual variable power supply and a good meter (my multimeter is only good for 10a) you would get truer info, but as you can see 1/2 voltage does not necessarily produce 2x amps in the same circuit.

[Deleted User]

I don't need to do my own testing , it's called Ohm's Law,
Roger

nick s

yes, Ohms law governs resistive loads. a motor is an inductive load, that gets into Faraday's law.