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MG MGA - Fuel Gauge reassembly

At some point I'm going to have to reassemble this.

Can you all take a peek at the photograph below and confirm if I have the correct assembly order shown?

Please note that in this order I have some bits left over which may have been added by the DPO.

Also note that the electro magnet spools are already mounted in the case.

Thanks


T McCarthy

Hi have a look at Barney's site

http://mgaguru.com/mgtech/electric/fg_01.htm


should help


Gordon
g c pugh

Thanks gordon, that was my first stop.

What is unclear from Barney's page is if the standoff bolts come in from the outside or rest in the inside.
T McCarthy

See this page: http://mgaguru.com/mgtech/electric/fg_05.htm
The standoff studs install with hex inside the case, then the insulator bushings with shoulder in front, then the wire wound resistor, connecting wire ring terminals, and insulating washers. The wire wound resistor cannot be grounded at either end.
Barney Gaylord

Barney,

That's where I got confused. You noted that the wire wound resistor can't be grounded against the case. Then if I put the stand off bolt in first with the hex resting against the case, followed by the shouldered bakelite insulator, then the wound resistor, the paper and another bakelite insulator the wire wound resistor will contact the bolt which is in direct contact with the case.

Perhaps you mean: from top to bottom

copper tabs from electro magnets.
two paper insulators
armature
hex (which is intregal to bolt)
bakelite insulator
paper
wirewound resistor
bakelite insulator
case
T McCarthy

I guess I jumped the gun a little without reviewing my own 8 year old tech article, maybe should have left well enough alone. It is true the wire wound resistor cannot be grounded at either end, but it does use the isolated terminal posts to connect to the magnet coils. Gordon had it right, start here:
http://mgaguru.com/mgtech/electric/fg_01.htm
The following pages give intimate details of what is connected and what is isolated.

The terminal posts are isolated from the case.
The armature is isolated from the posts.
Left magnet coil core is isolated from the case.
Right magnet coil core is grounded on the case.
Both magnet coils are connected to the right side screw post.
Left side coil is connected to the left screw post.
The wire wound resistor is connected to both posts by virtue of the wire touching the hex fitting on the post.
The posts are the connecting points for the three windings.
Barney Gaylord

This thread was discussed on 29/07/2008

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