Ferrari Mailing List: Re: 512TR (1992) Starting Problem -- Need New Battery?

[jashburne (jashburne]

Are you sure that the battery is really fully recharged after being only on a trickle charger trying to bring it up from dead flat?  I would try putting it on a regular charger with a healthy charging rate and see if that makes a difference. Then take it to an Autozone for a test under load to confirm it can hold a charge. 

John

Sent from my iPhone

On Jun 28, 2019, at 4:19 AM, pbennett [at] paul-bennett.com wrote:

Note - Optima red & yellow batteries have modified chemistry resulting in slightly higher voltage numbers.

A fully charged Optima is closer to 7v and charging circuits must be tailored accordingly.

See the Optima web page for details.

https://www.optimabatteries.com/en-us/support/charging/charging-tips

 

paul

 

--------- Original Message ---------

Subject: [Ferrari] 512TR (1992) Starting Problem -- Need New Battery?
From: "Doug & Terri" <dnt [at] dock.net>
Date: 6/27/19 9:37 pm
To: "Paul Bennett" <pbennett [at] paul-bennett.com>
Cc: "The FerrariList" <ferrari [at] ferrarilist.com>

OK gang – good bad and the ugly:

When a lead acid battery shows “12.0 v” (all leads disconnected) the state of charge for the battery is . . . . 25%

 

Here’s a chart:

100%    12.65

75%      12.45

50%      12.24

Discharged - - 11.89

 

11.89 v will light the dash etc.

Try this – dismount the battery.

Pick it up and hold it about 6 to 8 inches off the concrete

Drop it.  Do it twice to three times.

Knocks off grid crud (highly technical term) off of the lead plates.

 

Oy – put a rag over the top of the battery and wear protective glasses ‘cause if there is anyway acid can pop out it will send droplets out on to your prized Enzo Ferrari signed T-shirt.  Oh yeah, and on your arms which will prompt a question in about 5 minutes “OW – how’d that happen?”

 

Bon Chance.

Doug

 

 

From: Ferrari [mailto:ferrari-bounces+dnt=dock.net [at] ferrarilist.com] On Behalf Of Lashdeep Singh via Ferrari
Sent: Thursday, June 27, 2019 12:47 PM
To: DOUG <dnt [at] dock.net>
Cc: The FerrariList <ferrari [at] ferrarilist.com>
Subject: Re: [Ferrari] 512TR (1992) Starting Problem -- Need New Battery?

 

Larry, test the battery for voltage to see if it is really dead or not.

On Jun 27, 2019, at 11:54, Larry Bard <larrybard [at] hotmail.com> wrote:

There were a few times over the past winter that I neither drove, nor even warmed up my 512TR, and -- compounding the neglect -- didn't connect it to a trickle charger.  Predictably, when I then tried to start it, I discovered that the battery was dead. The last couple of months I've had it on a CTEK 3300 trickle charger.  However, when I then tried to start the car (after the charger indicator lights indicated that the battery was charged), it wouldn't turn over.  More specifically, when the key is turned to the initial ("accessories"?) position, all the lights glow brightly, but then, when I turn the key further clockwise to start the car, I think only two lights (maybe for the brakes) glow (dimly) -- and the engine doesn't "turn over."  Most likely dead battery?  If so, recommendations for a replacement?  I currently have a less than 4 year old NAPA 9834R battery in the car.

https://www.napaonline.com/en/p/NBP9834R

Not only do I have no idea how I originally chose it, but the NAPA website is now telling me that it is not an appropriate battery for my car.

 

Any advice would be greatly appreciated; needless to say(?), I would like a better alternative to driving the car to the ghetto and leaving it there.

 

Thanks,

Larry

 

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