9400 alternator problems - The Combine Forum
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post #1 of 16 (permalink) Old 11-05-2018, 09:24 PM Thread Starter
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9400 alternator problems

put new batteries and new alternator on john deere 9400 and still voltage alarm after using lights for about an hour

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post #2 of 16 (permalink) Old 11-05-2018, 10:21 PM
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This was not on a jd but have had a similar problem turned out to be a worn out belt and was riding on the tips of the pulley. New belt and wire brush out all of the crap in the pulley vees fixed the problem.

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post #3 of 16 (permalink) Old 11-05-2018, 11:16 PM
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Had same problem with my 9300, ended up being the ground cable from batteries to the frame. Looked fine but must have been corroded.
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post #4 of 16 (permalink) Old 11-06-2018, 06:38 AM Thread Starter
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Also replaced the belt the same time as everything else. Try to be proactive before the combine season started. I will check the ground and connections again.
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post #5 of 16 (permalink) Old 11-06-2018, 08:27 AM
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Check the connections on the relays and circuit breakers by the batteries. Also check voltage on each large post on the relays and make sure you are getting battery voltage on each post. Fixed a guys 9400 last year for same issue and one relay was bad and only getting 10.2 volts on output post and 13.2 on input post.
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post #6 of 16 (permalink) Old 11-06-2018, 01:54 PM
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#1 Don't assume the new Alternator is good. Measure the output with and w/o the lights on for 10 minutes.
#2 measure the voltage at the alternator output post and then at the battery +. Should be no more than a couple tenths of a volt lower. This will tell you if you have a bad wire/connection between the two.
#3 as suggested above, check both sides of the main contactors for voltage drop in the contactor. Very common.
#4--ditch the POS Motorola alternator and put on a 100A 1 wire Delco. Normally I'm not a big fan of 1 wire alternators, but in this case it works well. I had to drill a couple new holes in the spring mounting assembly so the pulley did not touch the fan pulley, but it solved all the low voltage issues I was having.
#5 Replace your lights with LEDs from Tiger lights. They fit right in place, and you will NEVER go back to using halogens. Less current draw, much more light, don't even need the dust diverter--lights punch right thru. Can see the cutterbar as clear as day.
Transaxial and chance2 like this.

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post #7 of 16 (permalink) Old 11-06-2018, 08:37 PM Thread Starter
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checked everything again before starting the machine the batteries where 11.8 volts does this mean I have a bad battery, they were bought new last week and there was no stray voltage bleeding over to the alternator. The relays that you where talking about were the (Bosch) relays that set on the back panel above the batteries or the solenoids that set beside the batteries? The solenoids all had the same voltage on both sides of the terminals. Does anyone have a charging diagram for a 9400?
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post #8 of 16 (permalink) Old 11-06-2018, 09:23 PM
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Typically see around 12.2-12.5v on batteries at rest. But if you ran it till the alarm came on and then shut unit down then batteries didn't get recharged. Best thing to do is measure battery voltage when unit is running. Should be around 13.8v.

Was a pretty common problem here to have combines we run get low on voltage as night went on, alternators were too small and of course one or two lights were added.
Keep in mind the alternator supplies the electrical system when engine running, battery is basically for starting. If your alternator is too small then you start drawing from batteries. So in that situation you need to figure out how many amps your alternator is putting out using an ammeter on the wire from alternator. Watching system voltage drop go down as hours go by tells you something but if you have a 60A alternator and you are drawing 70A then the conclusion is pretty straightforward. Bigger alternator or less load.
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post #9 of 16 (permalink) Old 11-06-2018, 11:56 PM
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Had a similar problem an my 9600, turned out to be one of the solenoids by the batteries. They would test out ok until you put enough amperage draw on it, then the voltage would drop as you turn more stuff on.
Good luck
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post #10 of 16 (permalink) Old 11-07-2018, 08:30 AM
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Yes, should have mentioned that you need to check voltages with A/C on, the lights on, motor running. Possibly even the electric clutches on. Those are the biggest current draws. The solenoids to check are the ones by the batteries.

Attached a schematic for one type of alternator, the other type just a has a slightly different field/control connection circuit, the charging circuit is the same.

Really sounds like you have too little alternator for your combine. Mine was doing exactly what you describe (except much faster) when my old alternator was only charging at 30A. The low battery voltage after running and shutting down also suggests this.

Attached Files
File Type: pdf Alternator Type A.pdf (84.1 KB, 14 views)

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