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  #11  
Old 10-27-2017, 09:27 AM
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I just bought a new starter motor positive post via Larry´s Thunderbirds. Now waiting two weeks or so for it to arrive.
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  #12  
Old 10-27-2017, 06:05 PM
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Quote:
Originally Posted by Frango100 View Post
I just bought a new starter motor positive post via Larry´s Thunderbirds. Now waiting two weeks or so for it to arrive.
Starter motors, generators and mechanical voltage regulators don't come in positive or negative ground. They only specify the voltage and maximum current.

Think about it, there is nothing solid state inside any of these components. Starter motors only have windings. Voltage regulators simply have relays, resistors and contacts.

So, how do boat people reverse their engines? By grinding a new camshaft. To reverse the rotation of a starter motor, simply switch either the field wires or the armature wires. (It's much easier to switch field wires inside the starter motor.)

I know a guy with a 55 Ford who had his battery connected in reverse. He brought the car to a garage and some kid installed the battery so he didn't notice for years. How on earth could that be? The car has a positive ground system but does it really matter?

Since the starter motor's field and armature were not changed, simply putting the opposite polarity on the motor has the same effect as switching both of them, causing the starter motor to turn in the same direction as before. Same story for the heater motor because it has separate field windings/armature, not permanent magnets. Gauges work from the heat that current causes, that's why there is no 'pos' or 'neg' on the posts of any Ford gauges. You simply cannot wire them wrong. Light bulbs don't care which direction, either.

BTW Frank, hang on to your old starter motor. It has many valuable parts inside, just in case... - Dave
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  #13  
Old 10-27-2017, 06:23 PM
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Default Ditto!

Just to add to what Dave said: in my younger days when getting around in a '4& F1 which was all original right down to the 6 volt system I used to at times refit the battery incorrectly after charging it up (a common occurrence as I couldn't afford a new one!) and would only realise it when all the gauges read backwards as I was driving along!

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  #14  
Old 10-28-2017, 10:54 AM
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Quote:
Originally Posted by simplyconnected View Post
Starter motors, generators and mechanical voltage regulators don't come in positive or negative ground. They only specify the voltage and maximum current.

Think about it, there is nothing solid state inside any of these components. Starter motors only have windings. Voltage regulators simply have relays, resistors and contacts.

So, how do boat people reverse their engines? By grinding a new camshaft. To reverse the rotation of a starter motor, simply switch either the field wires or the armature wires. (It's much easier to switch field wires inside the starter motor.)

I know a guy with a 55 Ford who had his battery connected in reverse. He brought the car to a garage and some kid installed the battery so he didn't notice for years. How on earth could that be? The car has a positive ground system but does it really matter?

Since the starter motor's field and armature were not changed, simply putting the opposite polarity on the motor has the same effect as switching both of them, causing the starter motor to turn in the same direction as before. Same story for the heater motor because it has separate field windings/armature, not permanent magnets. Gauges work from the heat that current causes, that's why there is no 'pos' or 'neg' on the posts of any Ford gauges. You simply cannot wire them wrong. Light bulbs don't care which direction, either.

BTW Frank, hang on to your old starter motor. It has many valuable parts inside, just in case... - Dave
I will not change the starter motor, only the stud. I will put new brushes in and some new paint on it for the looks. Spending too much on this car already, so will try to keep it cheap where possible. Just send the radiator away for a new core. It was repaired a few months ago, but started leaking at another spot last week.
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  #15  
Old 10-28-2017, 11:38 AM
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After you replace the terminal I would check it with an ohmmeter to make sure it's totally isolated from the case.

John
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  #16  
Old 10-28-2017, 01:46 PM
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Quote:
Originally Posted by Frango100 View Post
I will not change the starter motor, only the stud...
Sorry, I misunderstood. I thought you were getting a starter motor that included a positive post.

If you ordered #P 11102A Starter Motor Field Terminal from Larry's, it is a kit that includes the stud and all necessary insulators and nuts.

This is a common part that breaks because it is made of soft copper and people torque far more than 15-ft/lbs. Many torque wrenches don't start that low. Another cause: Do not let the terminal bear the brunt of vibration. Use a clamp on the engine block to support your starter motor wire. The 352 FE has a conveniently tapped hole on the passenger's side, just about in the middle of the block below the exhaust manifold. I use that one to strap the wire, with a 'cushion' around the wire made of tape or rubber. I also leave extra wire between the solenoid and engine for vibration. - Dave.
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  #17  
Old 10-28-2017, 07:14 PM
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All good suggestions Dave and John, I will follow that. Thanks.
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  #18  
Old 11-12-2017, 09:42 AM
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Soon i will receive the starter motor stud and can re-assemble the starter. There is quite some axial play on the armature shaft. Both front and rear thrust washers are in place. Is it normal to have quite some play on there? I couldn´t find any reference on this.
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