[AT] tractor electrical question

[John Hall]

If there is, I can't find it. Closes thing I have found is the 
diode/rectifier for the alternator. Its inline and is tied in on this 
particular "circuit" . Matter of fact, the side opposite the alternator 
is where the fuel solenoid feeds from.

John Hall


On 8/25/2021 11:05 PM, Spencer Yost wrote:
> Maybe there’s an external resistor?
>
> Spencer
>
> Sent from my iPhone
>
>> On Aug 25, 2021, at 10:35 PM, John Hall <jtchall at nc.rr.com> wrote:
>>
>> Got what I hope is a simple question. On my IH 454 tractor, is the voltage going to the coil a constant 12V? I'm having some issues with it running bad when it gets hot (I've already replaced everything but the plug wires). Found out today that if I run a jumper wire from battery to the coil, the problem goes away. Take it off problem comes back, put it back it goes away, take it off, it comes back. So I am tracing the wiring but this one isn't simple, new enough there are tons of gauges, fuel solenoids, safety switches, etc. Anyway, if I check voltage at the coil, the fuel solenoid, and there is one small terminal on starter solenoid that all read 12V if the switch is on. If I bump the engine over slightly (I guess the pts are closing) then the coil and starter drop to just under 6V, fuel solenoid stays the same. So shouldn't there always be 12V at the coil?
>>
>> John Hall
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