On Sun, 24 Oct 2010 19:18:07 -0500 Dieselhead <[email protected]> wrote:
Hey Y'all,
I am puzzled with a generator problem.
For what vehicle?
IH Tractor. Positive ground, 6 v. Battery voltage: 6.3v
From the armature terminal a wire goes to the cut-offswitch. Inside
there is a relay. When i push down to make contact, the output
terminal to the armature is energized. I have not seen the relay
engerize by itself
Can you get an ohmmeter on the relay's coil's terminals and measure its
resistance?
I have not been able to find one side of the coil. I plan to take
the other one I took off to the auto electric shop to test and see if
it is ok. If it turns out to be ok, then the problem is elsewhere.
I didn't plan to start this, but the weather was nice, and I thought
all I was doing was swapping the generator.
1. With the engine running: no voltage anywhere in the charging
system except at the battery terminal on the cut-out switch.
2. I checked continuity from the Field terminal to the resister,
then through the resistor All good, but I was not able to get from
the resistor to ground. I ran a temp ground from the resistor to the
battery. Started the engine, but still no generating.
Is there current flowing through the resistor under this condition? Does
the resistor really want to go to ground, or to the battery's positive?
1. I did not check for current after I did continuity.
2.It appears to be to ground. it goes to the case of the LHDB
selector switch, and that is attached to the electric box, which is a
chassis ground.
3. I checked continuity of what internal components of the cut-off
relay that I could. all appeared to be ok.
Ran out of daylight. I was not able to check voltage when holding
the relay switch closed AFTER i made sure the resistor had a good
ground. Not enough hands.
Get a helper, or tie one lead of the voltmeter to the chassis some way.
That way you'll only need two hands.
My old voltmeter had clips. that was handy. I have never seen
another meter with clips.
>
> IN theory:
>
> THe battery voltage passes through the relay to the armature.
> The field goes through a resister to ground.
>
> Seems simple. Is this the correct theory? What should I check next?
As I mentioned above, the field winding's terminal may want to be
connected to the battery positive terminal because the other end of the
field winding may be grounded to the case of the generator.
It is basically a delco generator, the same as any 1950 chevy. I
don't know how it is wired.
Is there any danger of frying the generator if I hook the battery
directly to the armature for testing at low engine rpm?
I don't know for sure. If all the relay does is connect the armature to
the battery, no. In that case, why bother changing connections; just push
the relay closed.
Seems like that and checking voltage , engine running, with the relay
points closed are the next thing to check.
I think checking with the relay points closed is the first thing to check.
YES Thanks.
Craig
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_______________________________________
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