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Something's wrong
#1
runninpony 
Hi All, after my brandnew AGM Autolite battery recently crapped out, I put in a battery from Costco, for now. Battery is at 12.6 Volts, but at starter solenoid I only measure 6.5 Volts. At the coil Voltage is 6.3 I cannot start the car in Park or Neutral. If I put it in neutral I get one "click" every time I try to start it. Any help is gladly appreciated! Thanks!

71-73 Mustangs never die, they just go faster!
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#2
Battery is bad (bad cell) or is not charged. Voltage as measured is the battery under load; your voltage at the battery is when the battery is not under load.

Let me check your shorts!
http://midlifeharness.com

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#3
Yep. A battery can produce “good” voltage, with little to no current...
Before you go chasing your tail take the battery somewhere and have it load tested.

Bad cell is a very strong possibility.
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#4
Not a t 5,
Sorry, you need to fill in the blanks here.
What terminal on the starter relay and what position was the key in and where was the ground side of the meter?.
If one assumes that it was on the battery side of the relay with the key on and you had only 6.5 v there, then it would only be logical to have the same voltage at the coil positive.
that would indicate high resistance in the positive cable or it's connections or the same on the ground side.
NOW take the same scenario on the pull in lead or starter side of the relay with the key on or in crank position and you change everything.
Really hope you just got a defective battery.
Boilermaster
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#5
Two defective batteries in a row. I guess anything is possible though not likely. There is a wiring issue somewhere IMHO.

'73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

'73 F code convertible. Bright red. Needs total restore. (IE HOT MESS)

- Jason
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#6
Unless you're lugging batteries around for the exercise benefit, or just like to, I would get a battery tester, not that expensive. After you get one you'll be surprised how much you use it.
https://www.harborfreight.com/100-amp-61...61747.html
https://www.amazon.com/Schumacher-BT-100...ery+tester



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#7
runninpony 
(10-07-2018, 08:42 AM)boilermaster Wrote: Not a t 5,
Sorry, you need to fill in the blanks here.
What terminal on the starter relay and what position was the key in and where was the ground side of the meter?.
If one assumes that it was on the battery side of the relay with the key on and you had only 6.5 v there, then it would only be logical to have the same voltage at the coil positive.
that would indicate high resistance in the positive cable or it's connections or the same on the ground side.
NOW take the same scenario on the pull in lead or starter side of the relay with the key on or in crank position and you change everything.
Really hope you just got a defective battery.
Boilermaster

Hi boilermaster, it measured 6+ Volts on the "S" terminal with the key in Ignition position. The ground probe was against the body of the car. There was no voltage on the "I" connector.

71-73 Mustangs never die, they just go faster!
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#8
runninpony 
(10-07-2018, 09:41 AM)73pony Wrote: Two defective batteries in a row. I guess anything is possible though not likely. There is a wiring issue somewhere IMHO.

73 pony, this was actually the third battery I've tried and please don't laugh...I just bought battery number 4.

71-73 Mustangs never die, they just go faster!
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#9
runninpony 
(10-07-2018, 10:50 AM)Don C Wrote: Unless you're lugging batteries around for the exercise benefit, or just like to, I would get a battery tester, not that expensive. After you get one you'll be surprised how much you use it.
https://www.harborfreight.com/100-amp-61...61747.html
https://www.amazon.com/Schumacher-BT-100...ery+tester

Don C, I just got back from the store, bought battery number 4 and shoot...I was looking at one of those battery testers!

71-73 Mustangs never die, they just go faster!
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#10
My guess is that you have a grounding issue, bad cable or bad connections. Does your ground cable run to the bottom bolt on the voltage regulator and then to the engine block? Or in some other way ground both the chassis and the engine. When you check voltages make sure your ground probe is getting a good ground, best to get it directly from the negative battery terminal.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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