The Ford Barn

AZ Chris · 06-22-2015, 12:33 PM

On a couple of occasions when testing things the ignition has been left in the ON position for an extended period of time causing the coil to boil.

Running a Mallory 58K V coil with internal resistor along with a Mallory dual point distributor.

Thinking we could add an external resistor but that would only drop the voltage and slow the problem. Adding a toggle from the ignition is the easy fix but could still be forgotten.

Haven't found anything in a search, has anyone come across this and how did you resolve it?

Thanks

flatjack9 · 06-22-2015, 12:37 PM

Turn the switch off?

ford38v8 · 06-22-2015, 12:55 PM

Flapjack has the obvious answer, but what is not so obvious is what your problem is?

AZ Chris · 06-22-2015, 01:03 PM

Quote:

Originally Posted by ford38v8

Flapjack has the obvious answer, but what is not so obvious is what your problem is?

Forgetting to turn the switch off when testing things

BUBBAS IGNITION · 06-22-2015, 01:04 PM

What is the resistance of the coil?? Mallory makes a 29219 58 K coil for electronic ignition thats 1.4 ohms and a 29216 thats .7 ohms...
Both are spec-ed out for electronic ignitions not points.....
I would check the coil if its getting really hot...

G.M. · 06-22-2015, 01:06 PM

Sponsored Links (Register now to hide all advertisements)

You have a 50/50 chance of not burning up the coil. If the points are open no problem, closed with a good battery the coil has a melt down. Install a battery disconnect. G.M.

AZ Chris · 06-22-2015, 01:22 PM

Quote:

Originally Posted by BUBBAS IGNITION

What is the resistance of the coil?? Mallory makes a 29219 58 K coil for electronic ignition thats 1.4 ohms and a 29216 thats .7 ohms...
Both are spec-ed out for electronic ignitions not points.....
I would check the coil if its getting really hot...

Happened with 29217 and with 29219 and according to the folks at Mallory these will both work for dual points.

Are we using the wrong coil?

ford38v8 · 06-22-2015, 01:40 PM

Quote:

Originally Posted by AZ Chris

Forgetting to turn the switch off when testing things

We all have that sort of defect! A failsafe solution would be to rig up a footpedal that powers up only when stepped on.

Shu47 · 06-22-2015, 02:12 PM

It's not failsafe but you could hook up an indicator light so at least it would be obvious the switch was still on.

ford38v8 · 06-22-2015, 02:31 PM

Quote:

Originally Posted by Shu47

It's not failsafe but you could hook up an indicator light so at least it would be obvious the switch was still on.

Sometimes I open the garage and find I'd left all the overhead "indicator" lights on the day before!

GB SISSON · 06-22-2015, 02:45 PM

How about a real annoying buzzer. I have done the same thing with ignition switch many times. I do it all the time with the valves my oxy-atcetylene setup as well. Slow leak, but very expensive. 15 minutes ago I installed a push-pull marine ignition switch in my panel truck instead of the toggle switch I was using. Hoping that might make a difference.

AZ Chris · 06-22-2015, 02:51 PM

How do you wire the buzzer so it is not on when the motor is running?

Mart · 06-22-2015, 03:32 PM

I'm sorry, but if you are troubleshooting other stuff that needs the ignition switch in the "on" position, just disconnect the coil.

How hard can it be?

Boiled the coil on a Buick once. It was never the same again. Had to replace it.

Mart.

bbrocksr · 06-23-2015, 09:00 PM

Quote:

Originally Posted by AZ Chris

How do you wire the buzzer so it is not on when the motor is running?

oil pressure switch.

AZ Chris · 06-23-2015, 10:44 PM

Quote:

Originally Posted by bbrocksr

oil pressure switch.

Perfect. Thanks

scooder · 06-24-2015, 01:38 AM

I do as Mart said, pull the coil feed wire.
Martin.

scooder · 06-24-2015, 01:40 AM

Quote:

Originally Posted by bbrocksr

oil pressure switch.

You'll probably have to get a real low pressure rated oil pressure switch. Else the damn thing will come on at idle when hot. Not uncommon for a flathead oil pressure to drop to almost nothing at idle when hot.
Martin.

06-22-2015, 12:33 PM	#1
AZ Chris Member Join Date: Jul 2014 Location: Tempe AZ Posts: 54	Power to coil On a couple of occasions when testing things the ignition has been left in the ON position for an extended period of time causing the coil to boil. Running a Mallory 58K V coil with internal resistor along with a Mallory dual point distributor. Thinking we could add an external resistor but that would only drop the voltage and slow the problem. Adding a toggle from the ignition is the easy fix but could still be forgotten. Haven't found anything in a search, has anyone come across this and how did you resolve it? Thanks

06-22-2015, 12:37 PM	#2
flatjack9 Senior Member Join Date: May 2010 Location: Oshkosh, Wi Posts: 4,527	Re: Power to coil Turn the switch off?

06-22-2015, 12:55 PM	#3
ford38v8 Senior Member Join Date: Jul 2011 Location: SF Bay Area Posts: 6,646	Re: Power to coil Flapjack has the obvious answer, but what is not so obvious is what your problem is? __________________ Alan

06-22-2015, 01:04 PM	#5
BUBBAS IGNITION Senior Member Join Date: May 2010 Location: SPEEDWAY INDIANA Posts: 4,148	Re: Power to coil What is the resistance of the coil?? Mallory makes a 29219 58 K coil for electronic ignition thats 1.4 ohms and a 29216 thats .7 ohms... Both are spec-ed out for electronic ignitions not points..... I would check the coil if its getting really hot... __________________ If it Makes Spark, we do it !!!! www.bubbasignition.com [email protected]

06-22-2015, 01:06 PM	#6
G.M. Senior Member Join Date: May 2010 Location: Florida and Penna. Posts: 4,471	Re: Power to coil Sponsored Links (Register now to hide all advertisements) You have a 50/50 chance of not burning up the coil. If the points are open no problem, closed with a good battery the coil has a melt down. Install a battery disconnect. G.M. __________________ www.fordcollector.com

06-22-2015, 02:12 PM	#9
Shu47 Senior Member Join Date: Feb 2011 Location: Maltby, Washington Posts: 187	Re: Power to coil It's not failsafe but you could hook up an indicator light so at least it would be obvious the switch was still on.

06-22-2015, 02:45 PM	#11
GB SISSON Senior Member Join Date: Jan 2014 Location: Orcas Island Washington Posts: 4,940	Re: Power to coil How about a real annoying buzzer. I have done the same thing with ignition switch many times. I do it all the time with the valves my oxy-atcetylene setup as well. Slow leak, but very expensive. 15 minutes ago I installed a push-pull marine ignition switch in my panel truck instead of the toggle switch I was using. Hoping that might make a difference. __________________ Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1947 Tonner Pickup (red) mostly stock with exception of a cummins 6at turbo diesel, 1946 Tonner Pickup (green) with 226 cu in 6 cyl flathead, 1979 Toyota landcruiser wagon, completely encased in 1947 Ford Jailbar sheet metal. Ok, cornbinder rear fenders..... 'Rusty ol' floorboards, hot on their feet' (Alan Jackson)

06-22-2015, 02:51 PM	#12
AZ Chris Member Join Date: Jul 2014 Location: Tempe AZ Posts: 54	Re: Power to coil How do you wire the buzzer so it is not on when the motor is running?

06-22-2015, 03:32 PM	#13
Mart Senior Member Join Date: May 2010 Location: Solihull, England. Posts: 8,755	Re: Power to coil I'm sorry, but if you are troubleshooting other stuff that needs the ignition switch in the "on" position, just disconnect the coil. How hard can it be? Boiled the coil on a Buick once. It was never the same again. Had to replace it. Mart.

06-24-2015, 01:38 AM	#16
scooder Senior Member Join Date: Jul 2010 Posts: 2,593	Re: Power to coil I do as Mart said, pull the coil feed wire. Martin.