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John Deere 445 Electrical problems
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Posted by Fred Emerson on October 09, 2004 at 15:50:00 from (220.127.116.11):
I went to start my 1996 John Deere 445 yesterday and it made some clicking noises like the battery was dead. I tried to boost it but had no results. I went to the dealer and bought a new battery. Well, it still doesn"t start. I have no lights except for an oil light and the green light on the control module. When I try to start it the oil light and the green light dim. When I try to turn on the lights the green light dims and the oil light will go out. I borrowed a manual from the dealer and started doing some troubleshooting. My meter shows 12 volts and I have 12 volts at the ignition. I found that I only have 12 volts (when the key is turned) coming out of the ignition when the yellow wire coming out of the lower right hand connector of the control module is taking out of the connector. It seem like I have a draw or short somewhere. There are no fuses blown. The starter doesn"t even try to turn over due to the lack of voltage ing the system. I was only getting 3.5 volts to the system with the yellow wire plugged in and the brake switch made. I decided to bypass the seat, pto and brake switches but there was still a voltage drop (i was getting 12 volts to the switches before they are made). I decided to unplug all three relays, the fuel injection control, and the harnesses to the motor to isolate the problem. I found that when I bypassed only the seat switch I had 6 volts coming out of the ignition and when I bypassed the brake switch also I had a total of 8.5 volts. I can hear the relay click when I make the brake switch and the second the relay turns on I get the 4 volt drop. I beleive the control /fues module has been damaged or there is something else shorted out. Does anybody have experience with these? Help would be appreciated.
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