John Deere 5420

   / John Deere 5420 #1  

bhoward

New member
Joined
Aug 26, 2018
Messages
1
Tractor
John Deere 5420
I replaced battery with a new one. Wrong connection. Big spark.Reconnected battery the right way.No start,no lights,nothing.What did I destroy?
 
   / John Deere 5420 #2  
Most likely the fusible link key 4 in the drawing. Possibly the diodes of the alternator too. 5420fusiblelinkkey4.gif
 
   / John Deere 5420 #3  
John Deere has been using diodes to protect against expensive damage to electronic parts when owners reverse battery cables.

Sometimes the diodes are in a cluster looking like a relay and located in the relay area.
oCyCXhy.jpg

kjvPnm9.jpg


Sometimes there are individual ones like this:
yJhNQ4L.jpg


Without a wiring diagram, locating the problem will be difficult.

Do you have a wiring diagram you could post?

Any damage to the alternator would not create a dead electrical system

Dave M7040
 
   / John Deere 5420 #4  
bhoward

A good friend, seeing my earlier post, provided me with a WSM for your tractor.

I need to know more specifics. For example 3 or 4 cylinder engine. Cab or no cab

If you have already solved your problem plse advise so my energies can be directed elsewhere

In my earlier post I made mention of Diode packs.
This is where the two are located.
iNT9jHR.jpg


Dave M
 

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