Join Date: Jan 2008
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Need help...major draw..any ideas??
I have this John Deer tractor at work that has a major draw. Its a 150hp engine. I have replaced the alt, solenoid, starter, batteries, heater motor and engine wiring. Voltage for batt is 12V at starter which is normal. I get 16 amps on solenoid . I have checked for corroded conn. at starter and batteries. All is OK. I measured the voltage drop across each positive and negative lead and also checked to see what the battery voltage is just after the shut down. I measured the resistance of the cable system and also checked for a parasitic loss with the key off. I have checked the output of the alternator (voltage and amperage). All checks out ok. The truck starts up NO PROBLEM>...then 1/2 hour later u can see the NEEDLE DROP and it dies. It reads at 120amp and should be NO MORE THAN 40 amp. I figure the dash couldn't even make a draw that big. I am an AG MECH...any suggestions??