Heres what i posted on Flickr
see
http://www.flickr.com/groups/yashicaelectro/discuss/72157604091732215/
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got to you tube and search yashica electro or search this video thats how it sounds the clunk is good heres the names of the videos
Yashica Electro 35/MG-1 Clunk. English & Portuguese
and another
Yashica Electro 35 GSN - "Yashica thump"
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Clunk is good
no clunk is Bad.
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To check the lights
with your electro - set camera to Auto, aim at a light source that gives you a yellow light, then with another camera with a working meter that you trust set the aperture to the same setting as on the electro and select a shutter speed of 1/30th, you should get a reading that is either OK or shows too little light for a correct exposure - in other words the electros yellow light comes on when the shutter speed is at or lower than 1/30th. - BTW there are normally 3 or 4 apertures from a yellow light to a red light.
on the electro - if you are in Auto and the shutter behaves like it is in B mode then the camera may need a pod replacement
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then links for repair once diagnosed
http://feuerbacher.net/photo/frame.html?Cameras/Electro35GSN/Electro35GSN.html~Main
and
http://www.erikfiss.com/foto/cams/docs/pad-repair.html
Good luck - i have done 3 electros and they all work now BUT doing it through the front as in the picture called "locating the POD", using a pin to hold the pod while manuevering it into position, some people have wrecked their electros by taking the lens off to replace a POD - I have NOT done it by removing the lens