Lucas Alternator

Billy NY

Well-known Member
What is the single spade connector circuit for ? ( as mounted on the motor, its the single connector to the lower left of the of 3 spade connectors with the larger connector with the black plastic cap on a Lucas 81863039R).

When I disconnect that wire, the test light with the bulb illuminated (in-line with positive cable end and + battery post) turns off. Is this a potential source of something shorted or draining the battery ? Both battery and alternator,(CNH dealer reman) are new, installed but not run yet. Factory alternator did the same thing.
 
you didn't say what tractor, but I will go out on a limb and say Battery Temperature Sensor. Now that I have baited the hook, someone will surely come along & say for sure. :wink:
 

Most likely the wire for the battery temp sensor located on the bottom of the battery box. If this sensor goes bad the alternator wont charge.

Did a search that said these Lucas alternators came on -600 and -610 series tractors.

Changed the alt on my MIL's 5600 last year, it had a Motorola alternator,
Alternator went out on the 6610 about 6 years ago, I think they gave me a Motorola to go back on, did have to change one wire so maybe it had a Lucas to begin with.
 
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Had a Lucas in my first car, TR-250 which now sell for $30-40K if in near new condition. When did they start the battery temp sensor? I've never seen or heard about that in 45 years of messing with electrical. What kind of temp range is this varying the output?



Also never saw a tach signal off the alternator, that signal was off the ignition coil or a cable off the back off the generator to run the tach.
 
That's about the same thing, connections are different. The site crash here delayed responding, but thank you for posting the photo.

So it appears that I can either wire in ( think there's a factory connector on that circuit ) a 200 ohm resister or replace the sensor.
 
(quoted from post at 13:21:27 08/25/16) That's about the same thing, connections are different. The site crash here delayed responding, but thank you for posting the photo.

So it appears that I can either wire in ( think there's a factory connector on that circuit ) a 200 ohm resister or replace the sensor.
here did 200 Ohm value come from? And 200 Ohms between that connector and what?
 
The suggestion about the resistor is easily found on the web. Of course that does not make it true. I was under the impression it would be wired in line. No way I'd install something like that without knowing more about it.

The sensor is part # 82988248 on the CNH site and is $48.04, will have to call the dealer and get the sensor.
 
Original Ford service literature. A 200 ohm resistor would display that value from one terminal to the other. The resistor is used as a test fixture to prove/eliminate the temp sensor as a cause for a no charge condition. Some folks choose to use it as a permanent repair solution.
 
(quoted from post at 07:27:56 08/26/16) Original Ford service literature. A 200 ohm resistor would display that value from one terminal to the other. The resistor is used as a test fixture to prove/eliminate the temp sensor as a cause for a no charge condition. Some folks choose to use it as a permanent repair solution.
rom that alternator terminal to ground? 200 Ohms equal a cold battery? And greater than? or less than? equals an over temperature battery?
 
Thanks for posting that, fortunately the dealer has a sensor in stock, I'll pick it up tomorrow and hopefully be back in the field again. I wonder what caused the sensor to fail, hopefully not problematic and the new one lasts like the OEM one, which is '97 vintage.
 

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