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12v conversion

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Russell

01-21-2001 14:12:00




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I am converting 6 volt 9-N to a single-pole alternator, 12 volt system. I bought a "kit" from a local tractor dealer who does quite a bit of work on older tractors, so I tend to heed their advice. I completed the conversion yesterday and got it to run, and the ammeter showed the battery charging. Today, however, the tractor will not start - the starter is turning very slow. With a voltmeter, I'm showing the voltage on the starter to be about 6 volts. I removed the wire off of the starter and measured the voltage on the starter wire at 12 volts - so it looks as if there is a problem in the starter. Someone tells me I need to have the starter rewired for 12 volts - is that correct? Also reading on this site, I read that one needs to add a ballast resistor to step down voltage to the coil - but my tractor guy didn't tell me about that - is that correct? Any ideas on my starter problems? Is there a short in the starter?

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Phil (AZ)l

01-21-2001 14:56:36




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 Re: 12v conversion in reply to Russell, 01-21-2001 14:12:00  
Russell,
<< I'm showing the voltage on the starter to be about 6 volts. I removed the wire off of the starter and measured the voltage on the starter wire at 12 volts - so it looks as if there is a problem in the starter. Someone tells me I need to have the starter rewired for 12 volts - is that correct?>>

NO! sounds like a bad Cable Connection in the Battery side. Unloaded Voltage has no meaning, other than no current is flowing. Reconnect and while cranking measure (look)
between the following points for the missing 6V

a) Neg Post of battery and Starter Frame

b) Pos Post of Battery and Starter Selenoid (Bat side)

C) Starter Selenoid (bat side) and Selenoid (Starter Side)

Make sure Bat is measuring 12V under LOAD


YES! you need Additional Ballast Resistance with the Front mount Coil.

Hope this Helps

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Claus

01-21-2001 14:30:00




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 Re: 12v conversion in reply to Russell, 01-21-2001 14:12:00  
It is the things that "they" didn't tell you about the usually get you. If you did not change to a 12 volt coil then you would need a dropping resistor to limit the current through the coil, in addition to the ballast. If you are only getting 6 volts at the starter and you have a fully charged 12 volt battery, then you have connectivity problems. Check your connections and make shure that they are tight and clean. (This includes the return path) In your case the negative lead from the battery to the chassis and any rusty connections of sheet metal etc... The starter will work fine on 12 volts provided you do not crank the heck out of it. This will overheat the starter. If you need to crank more than 10 seconds you need to take a break and let the puppy cool off. Feel it with your hand. All starter motors are designed for intermittent duty, otherwise the motor would have to be about the size of a big bread box. It just heats that much quicker with 12 volts due to the additional energy being consumed by the starter.
Happy Motoring
Claus

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