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I have a no crank situation on my john deere 1070 serial #

XXXXX Safety switches are functioning...
I have a no crank situation on my john deere 1070 serial # XXXXX Safety switches are functioning (SEAT PTO AND NEUTRAL) The starter cranks when voltage is applied to the starter solenoid via jumper wire.I replaced the starter relay , still nothing.Could it be the TDCM and how do I test it . Any suggestions would be much appreciated. thanks in advance. Tom
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Answered in 3 hours by:
10/10/2013
Mechanic: Curtis B., Technician replied 8 years ago
Curtis B.
Curtis B., Technician
Category: Agriculture and Farm Equipment
Satisfied Customers: 43,585
Experience: Technican turned service manager on multiple lines of equipment and rental equipment.
Verified

Curtis B. :

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Curtis B. :

# XXXXX is two starter relays, do you have power to them? These tow are same part number, check them and then swap them to see if it will start.

Customer:

As I stated in my original question ,I replaced the start relay.I tried the new relay (ref#4 in parts diagram) in both plug in positions .Still no crank .The rear relay clicks when power is supplied through key switch (power circuit) . The front relay has no power to it in either the power or crank position on key switch .There is power at the key switch and it is working. The limited information I have suggests power to the relay is routed through the tdcm.Is this correct and if so what is the test procedure for the tdcm ?

Curtis B. :

Without wiring diagram or the service manual, I assume the TDCM , is the control module. I don't find a TDCM listed. But if it was mine, I would look at the starter solenoid and find the switch wire, and follow it back to the relays. Where is the wire to the switch routed to? Also you say the safety switches are good. I find usually start problems involve the harness or switch to the pto switch or switches, as some units have switch for front and rear pto operation.?? With control about $200.00 , I would eliminate everything else first.

Customer:

The tdmc is time delay control module.I have checked the safety switches with a continuity meter and also by bypassing them with a jumper wire.The wire from starter solinoid goes dirrectly into a large harness and is impossible to follow without destroying the harness.I was hoping you had access to a wiring diagram and repair manual.

Curtis B. :

Here is a $39.00 downloadable manual. I will opt out and see if someone else will have diagram. Please do not respond to me or it will lock your question. Sorry.

Curtis B.
Curtis B., Technician
Category: Agriculture and Farm Equipment
Satisfied Customers: 43,585
Experience: Technican turned service manager on multiple lines of equipment and rental equipment.
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Mechanic: Michelle-mod, Moderator replied 8 years ago
Michelle-mod
Michelle-mod, Moderator
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