1949windsor Posted February 22, 2009 Report Posted February 22, 2009 I am rewiring and converting to 12 volt negative ground on my 49 chrysler, and I want to make sure I understand what I have read so far. I have and overdrive with the kickdown switch on the carb. I have read on here that I do not need to do anything to the overdrive solenoid (such as reducing the voltage or worrying about the polarity) Is this correct? I just want to make sure. I know that there are 2 sides to the 12v vs. 6v question, but I look at this the same way as disc brakes vs drum. The convience and ease of repair along with options available on 12v systems for me just outwieghs the coolness of the original product. I am rewiring with 6v size wire because the cost is not that much more and if anytime I wanted to change back the wiring would work. THANKS! Brandon Quote
PatS.... Posted February 22, 2009 Report Posted February 22, 2009 Are you sure you have overdrive on a '49 Chrysler and not an M6 semi-automatic? They are 2 different animals. Quote
1949windsor Posted February 22, 2009 Author Report Posted February 22, 2009 Are you sure you have overdrive on a '49 Chrysler and not an M6 semi-automatic?They are 2 different animals. NO....how do I check? Quote
Plymouthy Adams Posted February 22, 2009 Report Posted February 22, 2009 remember ohms law on the winding of any relay..at six volts and say .5 ohms you will draw 3 amps...with 12 volts and the same .5 ohms you will draw 6 amps...this increase will most likely burn out your relay coil due to the substained power applied to keep it engaged..if you want, you can take a good measurement of the resistance and add that same amount by using an inline resistor of the same value of as the relay, this will drop 1/2 the voltage across the resistor before it gets to relay...this should be a resistor of high enough wattage to disipate the heat..should the resistor fail..this will also act as a fuse per say and not allow the 12 volt to continue to the relay.. calculate your resistor wattage need by multiplying the current times the applied voltage.. Quote
PatS.... Posted February 22, 2009 Report Posted February 22, 2009 NO....how do I check? Are you driving the car??? Quote
Frank Elder Posted February 22, 2009 Report Posted February 22, 2009 For those of use who don't know, which is probably me and windsor, what are the differances? Always up for new info. Quote
PatS.... Posted February 22, 2009 Report Posted February 22, 2009 Well, the reason I asked is that I'm not sure any of the overdrives will fit or work on an M6, which is a 2 speed, 2 range semi-automatic transmission as opposed to the overdrive unit which is an add on to a regular 3 speed column shift transmission. The easiest way to tell if the '49 Chrysler has the M6 is to check the transmission shifter on the column. A regular 3 speed transmission will have first gear towards you and down from neutral. An M6 will not have this position. A '49 Chrysler Windsor came from the factory with a fluid connection and an M6. The base Chrysler Royal model came with the fluid connection and a regular 3 speed transmission. Quote
1949windsor Posted February 22, 2009 Author Report Posted February 22, 2009 Are you sure you have overdrive on a '49 Chrysler and not an M6 semi-automatic?They are 2 different animals. It is the m6 with fluid drive....I thought thats what the overdrive version was? I am not driving it yet. Still have to finish the brakes and electrical. Quote
1949windsor Posted February 22, 2009 Author Report Posted February 22, 2009 remember ohms law on the winding of any relay..at six volts and say .5 ohms you will draw 3 amps...with 12 volts and the same .5 ohms you will draw 6 amps...this increase will most likely burn out your relay coil due to the substained power applied to keep it engaged..if you want, you can take a good measurement of the resistance and add that same amount by using an inline resistor of the same value of as the relay, this will drop 1/2 the voltage across the resistor before it gets to relay...this should be a resistor of high enough wattage to disipate the heat..should the resistor fail..this will also act as a fuse per say and not allow the 12 volt to continue to the relay..calculate your resistor wattage need by multiplying the current times the applied voltage.. That's what I originally thought. There were a few posts from people stating that they were not reducing the voltage to the trans. I think I am going with inline resistors, they certainly cannont hurt. thanks Brandon Quote
wayfarer Posted February 22, 2009 Report Posted February 22, 2009 If you need to maintain any 6-volt sensative equipment then install 2-6volt batteries in series and then run a dedicated circuit to the item from one of the batts. This has been a common fix since the 12v system started. . Quote
Plymouthy Adams Posted February 22, 2009 Report Posted February 22, 2009 AND.........any good tractor site is a good place to check for schematics to install the split 6/12 system where you get the benfits of both with the lesser 6 being the generating/recharge circuit... Quote
Frank Elder Posted February 22, 2009 Report Posted February 22, 2009 Do you have a good tractor site in mind...I would like to see the schematic. Quote
Young Ed Posted February 22, 2009 Report Posted February 22, 2009 Well, the reason I asked is that I'm not sure any of the overdrives will fit or work on an M6, which is a 2 speed, 2 range semi-automatic transmission as opposed to the overdrive unit which is an add on to a regular 3 speed column shift transmission. quote]Pat it is possible to put an OD in place of the M6. I helped do it in a 51 dodge. However it was a complete swap one for the other you can't add it to an M6 Quote
PatS.... Posted February 23, 2009 Report Posted February 23, 2009 Well, the reason I asked is that I'm not sure any of the overdrives will fit or work on an M6, which is a 2 speed, 2 range semi-automatic transmission as opposed to the overdrive unit which is an add on to a regular 3 speed column shift transmission. quote]Pat it is possible to put an OD in place of the M6. I helped do it in a 51 dodge. However it was a complete swap one for the other you can't add it to an M6 Yes, Ed, that was my understanding as well, although I didn't state it as clearly as I could have Quote
Young Ed Posted February 23, 2009 Report Posted February 23, 2009 No prob Pat and I agree its very very unlikely he has an OD in there. Quote
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