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  #1  
Old 02-17-2017, 05:27 PM
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Question Interstate battery.

Hello Members,

I would like to replace the very small battery that my brother has in his 64 Thunderbird (with a 390 engine and AC).
I prefer Interstate batteries. So, my question is: does any member have a Interstate battery in there Thunderbird and if yes, can you tell the model or series number of the battery so I don't purchase the wrong one? Thank you.

Sincerely,

Patrick
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  #2  
Old 02-17-2017, 05:50 PM
RustyNCa RustyNCa is offline
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Quote:
Originally Posted by pat64tbird View Post
Hello Members,

I would like to replace the very small battery that my brother has in his 64 Thunderbird (with a 390 engine and AC).
I prefer Interstate batteries. So, my question is: does any member have a Interstate battery in there Thunderbird and if yes, can you tell the model or series number of the battery so I don't purchase the wrong one? Thank you.

Sincerely,

Patrick
I have an Interstate in my 58 I stole from my 65, I can get you the number when I am home tonight. But really any battery company should work, you just need the group number.
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  #3  
Old 02-17-2017, 06:12 PM
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Hello Rusty,

If you can get me the number I'd appreciate it. Thank you.

Sincerely,

Patrick
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  #4  
Old 02-17-2017, 08:06 PM
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Default Interstate battery

According to Jim Mills, VTCI 1964-1966 Technical Editor, for 1964 Tbirds, the VTCI OFS lists the battery to be 29N which is a 65 amp. had gray caps to identify it, this was used in low option cars.
The optional HD battery was a 27HF 80 amp with black caps. The 27HF was what would have been used in cars with A/C and other options such as power windows.

According to Interstate Battery, here is the one you want, a Workaholic 420 CCA, 29NF-VHD. Here is the link to it.

http://www.interstatebatteries.com/p...780-2147384903
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Old 02-17-2017, 09:54 PM
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If you're more concerned about performance then originality I would go with the 27F. It will fit just fine in the original battery tray and will give you more CCA. It is also much easier to find.

John
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  #6  
Old 02-18-2017, 09:49 AM
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Thank you John and Ray for the information.

Patrick
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Old 02-18-2017, 11:09 AM
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Default Interstate battery.

I concur with what John said about getting a 27F since your brother has AC on his Tbird. Interstate suggests the 29N if you want an OEM looking battery, but it has a lot less cranking power (only 420CCA) than the 27F. When you search the Interstate website, it is the 29N that comes up, instead of the 27F. However, speaking with my local Interstate Battery rep here, he said for a 1964 Thunderbird with AC and power accessories, you want the hardier MTP-27F instead. It gives you 710CCA. Here is more information about it. It is called a Mega-Tron Plus.

30 Month Free Replacement, 6 year performance warranty.

http://www.interstatebatteries.com/b...,A~Part+Number

http://www.interstatebatteries.com/p...~21-2147384906

I am aware that link states it is for a '59 Fairlane, but he says it is also for that '64 Tbird, and other models and years.
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  #8  
Old 02-18-2017, 02:57 PM
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Why do we need such a huge battery?
There's only one good reason, your generator/alternator isn't big enough.

I took a hard look at this a couple decades ago when all of a sudden, battery capacities were downsized in modern Mustangs.

Wouldn't you think a large engine requires a large battery? No. We only need a battery with enough capacity to start the engine in cold temp's. After the engine is started, alternators begin charging at idle speeds and above. 'Alternators' is the operative here.

When Squarebirds were built, generators began charging above 1,000 rpm. Below that speed, the field windings in the generator actually drained the battery at idle speeds as characterized by your GEN light flickering at a stop light. To make matters worse, the mechanical voltage regulator energized two relay coils. Not a problem if the car was moving but it was a problem when we typically start the engine then go outside to shake off the snow. During that 'warm-up' time, the battery is draining even further. Don't forget about running the heater/defroster motor, radio (to hear weather/traffic reports) and headlights because it's normally dark before work's starting time in winter. So, batteries needed lots of reserve power to help a feeble 30-amp generator system.

I will always advocate for swapping your generator for a 3-wire alternator. All new cars come with one, the brand means little to me and they are internally regulated. Alternators start charging immediately upon engine motion. (One-wire alternators do not but that's another discussion.)

I understand, folks rarely use their Squarebird in winter or for work these days. Classic Car service is milquetoast by comparison. Regardless, think of future accessories when choosing an alternator. Get one large enough to run an electric cooling fan so at prolonged idle speeds, never worry about overheating, even with A/C running. Since an alternator's supply now meets the demand, a simple battery will do just fine.

Here's one for UNDER $50 at Walmart:

It has 585-CCA which is the number of amps a 12-volt battery can deliver at 0F for 30 seconds while maintaining a voltage of at least 7.2 volts.

When you get into high CCAmps, the price jumps 100-300% or more. For fifty bucks, c'mon, I'll buy two and use the other as a portable backup, stored in a battery box in the trunk. If you really need huge CCA's, connect both batteries and enjoy 1,170-CCA's for a hundred bucks. This is over the top because you only need one. In winter, I use a 'spare' on my test bench. It beats those portable HF starting boxes, too. - Dave
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Old 02-18-2017, 03:02 PM
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The model I have is a MTP-65 which shows it has CCA-850 CA 1,000 Positive lead is on the right, neg on the left.

And I have done what Dave has, most of my newer batteries have all come from Walmart, except I've been buying the $100 ones.

For example here is Walmart's Group 65 battery.

https://www.walmart.com/ip/EverStart...3=2537&veh=sem



Quote:
Originally Posted by YellowRose View Post
I concur with what John said about getting a 27F since your brother has AC on his Tbird. Interstate suggests the 29N if you want an OEM looking battery, but it has a lot less cranking power (only 420CCA) than the 27F. When you search the Interstate website, it is the 29N that comes up, instead of the 27F. However, speaking with my local Interstate Battery rep here, he said for a 1964 Thunderbird with AC and power accessories, you want the hardier MTP-27F instead. It gives you 710CCA. Here is more information about it. It is called a Mega-Tron Plus.

30 Month Free Replacement, 6 year performance warranty.

http://www.interstatebatteries.com/b...,A~Part+Number

http://www.interstatebatteries.com/p...~21-2147384906

I am aware that link states it is for a '59 Fairlane, but he says it is also for that '64 Tbird, and other models and years.
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  #10  
Old 02-18-2017, 04:28 PM
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The downside to the 24F is that it isn't long enough to use the factory battery tray mount. You will have to fabricate something to hold it in place. I don't like to leave my batteries without a hold down.

John
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