Question about 1965 Ford Mustang

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Charging alternator is good control box is new batterie still wont charge 1965 coupe

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  • 65fastback Aug 02, 2008

    New battery & regulator, alternator bench tested OK. Only getting 12.65 volts accross battery with engine running at 2000 RPM. Battery gradually needs charged after a few days of driving to work, etc. 289 4 barrel, 4 speed from a 66 coupe, now in a 65 fastback.

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If you haven't done it yet, check the alternator drive belt and associated pulley surfaces. If there is slippage, your alternator will not charge the battery. As always, with these old horses, verify that all of your grounds are good.
Cheers!
Ron

Posted on Feb 20, 2009

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Double check your fusible links at the starter solonoid. If one of them is burned, the charging system will not work. I'm assuming the control box you're referring to is the voltage regulator. Trace the wiring between the regulator and the alternator as well. I've had to run new wiring between the two before especially on the early iron. I have a 68 Mustang myself and had the same issue before and decided to use a Chevy 1 wire alternator instead. Definitely a much more simple set up being that the regulator is built in. It looks stock and I was able to clean up excess wiring in the engine bay for a cleaner look. Let me know if you'd like step by step installation of the Chevy alternator. It's very simple. My email address is proracer88@live.com. I've had problems in the past receiving emails so I may need yours so I can get you the information. Try this address as well tiqautoperformance@live.com. I'm really big into the early Mustangs. Mine runs a 331 stroker with a 4400 converter/C-4 reverse pattern trans. with an 8in. rear, 4.11 gears. Goes 11.81 @ 114 on pump gas and I drive it all over the place. Never gets over 170 degrees on a really hot day either.

Posted on Jul 13, 2008

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Already replaced new battery, new alternator, fuse, and pt connector - voltage sits at 12.9 running - system still not charging?


It isn't a good idea to disconnect the battery while it is running as the resulting voltage surge can damage electronics. Obviously if it isn't charging there won't be much of a surge...

Some alternators are mounted in rubber to cut noise and vibration. This type needs a ground wire which is sometimes forgotten during replacement and sometimes the ground wire just breaks.

A standard alternator only needs two or three wires and sometimes a ground wire. If the direct connection to the battery is good, the ignition light wire intact and working and if needed a battery sensing wire (though this wire isn't often needed in the last couple of decades) the alternator, if it is any good, will charge the battery at the regulated voltage of about 14.5.
If you are sure the alternator is a good one and it isn't charging the connecting wires must be at fault and need to be checked.

There is one other possibility and that applies only in the case of smart charging systems. If your car has a smart charging system the alternator will have several extra wires, usually plugged into the side of the machine.
The alternator works in a similar way to the standard unit except instruction from a separate control unit is capable of reducing or suspending charging. The smart charge black box talks with the engine management black box and charging is suspended during acceleration to cut fuel consumption or improve acceleration. A fault in the smart charge system can prevent the alternator charging.

Disconnecting the additional wiring will allow the alternator to perform its normal function without interruption. The ignition, charge or battery light is controlled by the black box and can do strange things that mean nothing when the smart charge is disconnected.

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Lets start with the battery, just because the car starts in the morning does not mean the battery is good, A bad battery will start the car and as car is running and drawing power out of the battery the battery which is getting charged back up from the alternator but if battery is bad and not accepting the charge this will do a few things.
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