Full Wave Bridge rectifier conversion pictures

[Plane Bart]

I got side tracked with an air compressor but did install the
Radio Shack Full wave bridge rectifier part#275-1185 25 amp, 50 volts

a

Drill out the 2 wire cut out relay remove guts, file off the small knub on plate.

Installed heat shrink and spade terminals.

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[Plane Bart]

Generator wire gos to the positive terminal AKA the one opposite of the other three, used a volt meter to determine which terminal to put the battery on chose the one with 6.5 volts DC

 

[36 Coupe]

Cable ends look awful close on the starter switch.Dont forget the diode has a.7 volt drop that produces heat.

 

[souNdguy]

you have really got to stop loosing sleep about that pitifull forward voltage drop.

you do realize you are sweating about less than 8w on a case that is designed to dissipate many times that???

 

[W_B]

For the uninitiated, non-electrical among us, what's the purpose of this?

 

[gatchelguy]

What is a full wave bridge rectifier and what does it do and why is it needed on a 2/9N???

 

[JMOR]

(quoted from post at 10:54:39 09/17/12) What is a full wave bridge rectifier and what does it do and why is it needed on a 2/9N???

t is just 4 diodes in a common package, wired to provide rectification of 2 wire AC input & yield 2 wire DC output, which has nothing to do with the application in the tractor. People use it to replace the electromechanical cut out on 9N/2N tractors. It is just a readily available diode from the omni-present Radio Shack Stores. They don't sell a single high current diode, but do sell the 4 diode bridge package for high current, so people buy it, connect one of the 4 diodes & let the other 3 sit idle. The 1 connected diode acts like a check valve in that it lets current flow from generator into battery, but prevents the reverse, i.e., prevents the battery from discharging into the generator.

 

[Wings]

Are you not aware that only 1 of the 4 diodes in a bridge rectifier package is being used?

A single diode is all you need to prevent the battery from discharging back through the generator due to a bad cut out relay.

 

[souNdguy]

solid state cut out.. it's a 1 way electron valve..

 

[Mr. T. Minnesota]

JMOR,
What is the total cost of the bridge rectifier? I have a complete single diode unit on two 6 volt systems at the cost of about $30.00 each. There is no fabrication involved. Just curious!!
Mr. T. Minnesota

 

[JMOR]

(quoted from post at 15:11:05 09/17/12) JMOR,
What is the total cost of the bridge rectifier? I have a complete single diode unit on two 6 volt systems at the cost of about $30.00 each. There is no fabrication involved. Just curious!!
Mr. T. Minnesota

er is 50A for about $5. Many on their site.
http://www.radioshack.com/product/index.jsp?productId=12678415

 

[Plane Bart]

Full wave bridge rectifier was $5.00 bucks

 

[Hobo,NC]

Nice post I have never been their it clears it up...

 

[JMOR]

(quoted from post at 20:23:27 09/17/12) Nice post I have never been their it clears it up...

f you leave a bit more of the original cut out base, then it will look virtually stock, like this:
https://photos.yesterdaystractors.c...=5&Parameter=cutout&w=pieces&cc=0
https://photos.yesterdaystractors.c...=5&Parameter=cutout&w=pieces&cc=1

 

[36 Coupe]

You dont know much about old Ford generators.They were rated at 70 watts and wound with a #17 wire in the armature.They tended to burn running at 8 volts.Loose connections in the charging circuit let the voltage climb.Do you know that turning on the head lights too soon after starting the engine would burn out the bulbs on a Ford car with a 3 brush generator in cold weather.

 

[36 Coupe]

You will see a much higher voltage with out the battery load.

 

[souNdguy]

typical..

you get caught on a technical detail and you resort to eithr changing the subject or trying to deflect.

Also.. an 11a 6v generator should be rated for 80w minimum.. the later ones should do 150 to 180.

remember.. charve voltage on a 6v cell is 7.2v

voltage doesn't burn wire.. the only thing voltage will play a roll in is figuring wattage dissipation when viewed with amperage int he circuit, and what type of insulation you need on the wires and windings.

Lets stick to some real electrical principles here and not 1930's era scare tactics and myth-understandings.

loose connections aren't my concern.. that's a maintenance issue. if someone doesn't maintain their machine. thet's their problem to deal with.



soundguy

 

[Plane Bart]

(quoted from post at 20:34:00 09/17/12)

(quoted from post at 20:23:27 09/17/12) Nice post I have never been their it clears it up...

f you leave a bit more of the original cut out base, then it will look virtually stock, like this:
https://photos.yesterdaystractors.c...=5&Parameter=cutout&w=pieces&cc=0
https://photos.yesterdaystractors.c...=5&Parameter=cutout&w=pieces&cc=1

Humph I may go dig in the trash can and change it looks better should only take a half hour or so.

 

[36 Coupe]

You spelling looks like you have drained a 6 pack.11x6 is still 66 not 80.

 

[Ken(Ark)]

11x6 is still 66 not 80.

Where did the 6 come from ?

11 x 7.2 = 79.2 so an 80 watt rating would be correct ? no ?

I am not an electrical guru but I can comprehend simple English .


[b:2e0c0c3ca2]Also.. an 11a 6v generator should be rated for 80w minimum..

remember.. charve voltage on a 6v cell is 7.2v [/b:2e0c0c3ca2]

 

[36 Coupe]

Generator is not putting out 7.2 v full time.What happens to the wattage when the generator puts out 8 v which it will have to do when the .7 drop of the diode is figured in.How high will the voltage go on a cold battery.The 9n tractor has the same charging system as the Model T Ford, Model A Ford and Ford cars and trucks until late 1938.I have owned a Model A, 3 36 Fords and 1 38 Ford with 3 brush generators.I know that loose conections or poor grounds can burn out light bulbs and generators.I know that a 3 brush generator can run over 20 volts when Dufus pulls the battery cable off to see if the generator is charging.I was taught to read the ammeter.

 

[36 Coupe]

Ford rates 11 amp car generators at 119 watts.I expect because they have cooling fans and run at a higher speed.Ohms law gets tripped up at times.

 

[36 Coupe]

How about posting some voltage readings with the generator charging.Voltage at generator armature, voltage at diode out put, voltage at battery.