battery

[coolcoupe]

Wondering what amperage I should be looking at for a battery disconnect for my 47 Monarch ? Thanks for now,, Moe

[tubman]

If it's still 6 volts, OPTIMA - 800CCA. Unless you're just going to show it. 12 volts? Just about anything that fits will work.

[HDowse]

I bought the stock battery disconnect that I mounted on the firewall from Joe's in MA. No problems, seems to carry the 6volt starting draw just fine.

[paul2748]

Ar you looking for a battery or a disconnect for the battery? If a disconnect, I use a 1/2 inch wrench - just loosen the nut on the ground cable and take it off. Works every time and nothing goes bad or breaks

[coolcoupe]

Sorry, it's 6 volt. I wanted to know how low in amps can I use or what was the normal that was used.

[JSeery]

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It has to be able to carry the full amp load on the battery you are using. CCA (Cold Cranking Amperage) might be a good guide.

[coolcoupe]

Thank you, JSeery. That's what I needed. What a great forum for knowledge !!

[JSeery]

More correctly, it would be the the current draw of the starter. That would be the maximum load the switch would see.

[fordor41]

I bough a disc. sw from a big time auto electical supplier and when I got it home it said 35A. I called them and asked about starter amp draw thru the switch. He seemed to not know how much a starter could draw. Then said " the boss has one on his car and doesn't have any problems". I don't run the starter thru mine! everything but.

[JSeery]

The switch should have an instantaneous rating and a continuous rating. 35A would sound like a continuous rating,

[koates]

Starter current draw could be around 350 amps depending on battery condition, starter motor condition and engine load, and how fast the engine starts up. A switch capable of handling 350 amps for around 15 seconds cranking at a time would be a good start for a 6 volt ford flathead system. It would have a continuous rating of about 100 amps. Look for a truck type all metal housing type and not the cheap plastic housing type which are very marginal in quality. Of course the heavy duty ones cost a lot more. The one I use is rated at 1000 amps and has large brass contacts and terminal studs. Regards, Kevin.

[coolcoupe]

Hi Kevin, Can I ask where you purchased your's and the make/model number ?
I can't seem to find a vendor up here in Canada that has one like you mention.
I do want to install a heavy-duty one. Thanks for now, Moe

[JSeery]

Originally Posted by coolcoupe

Hi Kevin, Can I ask where you purchased your's and the make/model number ?
I can't seem to find a vendor up here in Canada that has one like you mention.
I do want to install a heavy-duty one. Thanks for now, Moe

I'm not Kevin But in general Boat Supplies or Heavy Truck Supplies should have a selection. Should be a lot of both in Canada I would think.

[50fordcoupeman]

JSeery............would a knife-blade type disconnect be a suitable choice? I have used those before with no problems but I don't know what the amp rating was.

[JSeery]

It would work fine if it is heavy enough to carry the current. Just as a general guess, the cross-section of the parts would need to be in the same range as the cross-section of the positive or negative lead to the battery. The issue I would see is keeping it protected as it would have a lot of open area.

[50fordcoupeman]

Originally Posted by JSeery

It would work fine if it is heavy enough to carry the current. Just as a general guess, the cross-section of the parts would need to be in the same range as the cross-section of the positive or negative lead to the battery. The issue I would see is keeping it protected as it would have a lot of open area.

Thank you!!