Author Topic: Starting Problems Help  (Read 1195 times)

Offline ClevelandKid

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Starting Problems Help
« on: September 28, 2024, 02:56:43 PM »
Having starting problems with my 70 351C I have a new alternator and new starter solenoid. My Battery reads 12.4V turned off and 14.4 while running. It won't start with out the battery jumper on The solenoid makes that gnarling noise when you turn the key on. But if I put my remote jumper on the battery it fires right up. Could it be the starter? I bought it at Auto Zone in 2005 and has a life time warrenty. But have only 500 miles on the starter. Cleaned off all cable connections. Any help would be appreciated.
Mustang country. Get the women,kids and Chevys off the streets.

Offline RocketScientist

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Re: Starting Problems Help
« Reply #1 on: September 30, 2024, 03:22:03 AM »
I had a similar problem and it was as simple as a poor connection between the battery terminals and cables - not good enough to start the car but Ok when running.

Offline dave6768

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Re: Starting Problems Help
« Reply #2 on: September 30, 2024, 08:44:23 AM »
It's very possible the starter solenoid is bad out of the box.  Ask me how I know.

Offline 67350#1242

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Re: Starting Problems Help
« Reply #3 on: September 30, 2024, 10:21:52 AM »
Really sounds like battery.  Try starting with voltmeter on battery and watch for drop.  Static voltage across the battery doesn't tell you much, but when drawing current you can tell how strong the battery really is.
67 Coupe SJ 11/16/66
67 GT350 SJ 2/01/67

Offline rhjanes

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Re: Starting Problems Help
« Reply #4 on: September 30, 2024, 10:40:45 AM »
Really sounds like battery.  Try starting with voltmeter on battery and watch for drop.  Static voltage across the battery doesn't tell you much, but when drawing current you can tell how strong the battery really is.

I agree, sounds like the battery is in the process of failing.  Or run a load test on the battery.   If you don't have a battery Load Tester, take the car up to your auto parts house and let them test it.  Or better yet, take the battery out.  Take it to them.  They will first charge it up and then load test it.   You can ask them to load test it prior to the charge but some seem to balk at that.  I've had batteries doing exactly what you say.  Reading about 12.4 volts static.  Reading the 14+ when running (meaning the alternator and volt regulator is working) and yet starts are sluggish.  A load test shows a failing battery or it it "Dinks" to zero, a shorted battery.  I don't think yours is shorted as you are still able to mess around and get a start. 

Remember the batteries number one job is starting the car.  After that the charging system is in "charge" (pun intended).
1969 Mustang Coupe, 302-2V, auto, air, PDB, Lime-Gold.  In the family since 1972
1969 Mustang Mach 1, 428 CJ Ram-Air, Auto, air, PDB, PS, Grabber Orange.  Self restored (for the most part).
2008 Mustang GT Convertible.  Weekend driver.

Always looking to learn and improve the cars.

Offline ClevelandKid

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Re: Starting Problems Help
« Reply #5 on: September 30, 2024, 05:06:14 PM »
Ok thanks guys I will try the things suggested. I took the stater out and took it back to Auto Zone.They gave me a free replacement. The one I took out of my car was purchased in 2005. It had a lifetime warrantee. I did try 3 different starter solenoids so I don't think its that. The battery had a manufactured sticker of 5/20. But I haven't driven it much since then.
I'm not much of a spark chaser so again thanks for your tips. I'll report back when I try the things you suggested. ;)
Mustang country. Get the women,kids and Chevys off the streets.

Offline rhjanes

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Re: Starting Problems Help
« Reply #6 on: October 01, 2024, 10:02:47 PM »
Ok thanks guys I will try the things suggested. I took the stater out and took it back to Auto Zone.They gave me a free replacement. The one I took out of my car was purchased in 2005. It had a lifetime warrantee. I did try 3 different starter solenoids so I don't think its that. The battery had a manufactured sticker of 5/20. But I haven't driven it much since then.
I'm not much of a spark chaser so again thanks for your tips. I'll report back when I try the things you suggested. ;)

4+ years old.   On a Battery Tender/Minder?  Otherwise, it's has Sulfated and it is probably the issue.  Batteries are fickle.  Load Test it. 
1969 Mustang Coupe, 302-2V, auto, air, PDB, Lime-Gold.  In the family since 1972
1969 Mustang Mach 1, 428 CJ Ram-Air, Auto, air, PDB, PS, Grabber Orange.  Self restored (for the most part).
2008 Mustang GT Convertible.  Weekend driver.

Always looking to learn and improve the cars.

Offline ClevelandKid

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Re: Starting Problems Help
« Reply #7 on: October 02, 2024, 05:20:19 PM »
Thanks everyone. It was the battery. Put a new one in and liftoff when I turned the key on. Now I just have to reset the auto choke and fast idle. It runs at 2200 rpms with the choke on. Drops down to 850-1000 once it's warmed up. Yea these are all wet tested and adjusted from the factory. NOT !!! Had to adjust the float level too.  >:(
Mustang country. Get the women,kids and Chevys off the streets.