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Dave, --- Likely nothing wrong with either of
those devices, and they should both work okay.
The starter motor draws up to 200 amps at 12
volts, so internal resistance is nearly nil,
something less than 0.06 ohm, and it does look like a short to ground.
The Dymano puts out up to 20 amps at 16 volts
max, working against 12.6 volts open circuit
voltage of the battery, so only a few net s to
drive he current. So dynamo armature resistance
is also very low. Think how fat the wires are in that armature.
The generator field coils may draw something like
2-amps at 12 volts, so maybe 6-ohms resistance
between the "F" terminal and gound on the housing
(but I don't recall ever measuring it). Power
input requirement is not much more than a pair of
brake light bulbs, maybe half of the power draw of the ignition coil.
Barney Gaylord
19589 MGA with an attitude
http://MGAguru.com
At 04:05 PM 5/12/2023, dave northrup wrote:
>The attached 2 pictures show the generator and
>the starter. I think there are problems with
>both. Rebuilding the car from scratch with a
>new wiring harness; the dpo just used red, blue,
>and black so I cut the wires out.
>
>The two tabs on the generator =96 both show a
>connection to ground with a multi meter. I=92m pretty sure that=92s bad.
>
>The post on the starter =96 it too shows a
>connection to ground with a multi meter. That=92s bad, too, right?
>
>Actually, I=92ve used 2 different multi meters
>with the same result. And by ground I mean the chassis of the device itse=
lf
>
>No battery installed yet, and the rest of the
>car is disconnected from these devices.
>....
>Attachments:
>starter.jpg
>generator.jpg
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<font size=3D3>Dave, --- Likely nothing wrong with either of those devices,=
and they should both work okay.<br><br>
The starter motor draws up to 200 amps at 12 volts, so internal
resistance is nearly nil, something less than 0.06 ohm, and it does look
like a short to ground.<br><br>
The Dymano puts out up to 20 amps at 16 volts max, working against 12.6
volts open circuit voltage of the battery, so only a few net s to drive
he current. So dynamo armature resistance is also very low. Think
how fat the wires are in that armature.<br><br>
The generator field coils may draw something like 2-amps at 12 volts, so
maybe 6-ohms resistance between the "F" terminal and gound on
the housing (but I don't recall ever measuring it). Power input
requirement is not much more than a pair of brake light bulbs, maybe half
of the power draw of the ignition coil.<br><br>
Barney Gaylord<br>
19589 MGA with an attitude<br>
<a href=3D"http://mgaguru.com/"; eudora=3D"autourl">http://MGAguru.com<br><b=
r>
<br>
</a>At 04:05 PM 5/12/2023, dave northrup wrote:<br><br>
<blockquote type=3Dcite class=3Dcite cite=3D"">The attached 2 pictures show=
the
generator and the starter. I think there are problems with
both. Rebuilding the car from scratch with a new wiring harness;
the dpo just used red, blue, and black so I cut the wires out.<br>
<br>
The two tabs on the generator =96 both show a connection to ground with a
multi meter. I=92m pretty sure that=92s bad.<br>
<br>
The post on the starter =96 it too shows a connection to ground with a
multi meter. That=92s bad, too, right?<br>
<br>
Actually, I=92ve used 2 different multi meters with the same result.
And by ground I mean the chassis of the device itself<br>
<br>
No battery installed yet, and the rest of the car is disconnected from
these devices. <br>
=2E...<br>
Attachments:<br>
starter.jpg<br>
generator.jpg</font></blockquote><div id=3D"DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F=
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