Identifying a capacitor with marking K1G 103J
According to this and this webpages, 103J would mean 10 * 1000 pF = 10000 pF = 10 nF with 5% tolerance.

K1G maybe refers to voltage. Maybe it is a value between 1H and 1J (50 VDC &lt; Voltage &lt; 63 VDC)?