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Voltage regulator

G

Gleanerk2

Member

My voltage regulator went bad on my farmall 806 gas! So I went to napa bought one put it on looked identical to the one Iook off now my idiot light wont go out unless its running about 1800 to 2000 rpm its not charging till then what can I do to get it to charge at lower rpm mine has a alternator not a generater
 
If there was nothing wrong except the VR that you replaced & if you wired it correctly when replacing, then it seems that the obvious answer is to replace the new defective regulator. Yes, there are those pesky "ifs".
 
Did you have the alternator checked? Could be a diode or open circuit in the alternator reducing the output. Most auto supply's have a machine to test them. If it checks good could be a defective regulator. Also be sure the regulator base is grounded.
 
Make sure the regulator has a good ground from the base to the tractor. Check to make sure the ground strap on the shock mount is in good shape.

To test the alternator, remove the f terminal wire from the connector at the alternator and leave it disconnected while you run a jumper wire from the output terminal to the f terminal on the alternator. This puts the alternator into maximum output. If you still have the same symptoms the problem is in the alternator.

To do this test you must disconnect the F (field) wire from the alternator and leave it disconnected. The regulator will connect this wire to ground when the voltage goes above the maximum voltage setting. Just running a jumper wire without disconnecting the wire will destroy the p0ints in the regulator.
 
On many early IH tractors, 806 maybe included, there is a white porcelain resistor down there by the regulator that helps excite the alternator.

If that resistor has gone bad, the alternator will only excite at very high rpm, if at all.
 
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