I would have thought that you should turn the control right down (usually fully anti-clockwise) before connecting the glow plug. Once connected the control should be slowly increased until your plug shows a medium bright orange glow, the setting will likely be different for different glow plugs. Make a note of the current so that you can reset it for individual plugs.
Faulty product
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I would have thought that you should turn the control right down (usually fully anti-clockwise) before connecting the glow plug. Once connected the control should be slowly increased until your plug shows a medium bright orange glow, the setting will likely be different for different glow plugs. Make a note of the current so that you can reset it for individual plugs.