Uno DS heater light

It happens a lot lately that heater light(yellow one) doesn't turn on.Once I touched some connections in front of the car where are connected also front
lights and then the heater lit up. After a while it happened again. My dad dissambled that plastic around steering wheel and touched some wires & the heater light lit up again & i started it normally.Today I wanted to start my car but there was no light,AGAIN.I removed plastic around steering wheel, spent half an hour touching & examining wires, tried something under the hood, but without success.Heater is apparently loosing contact somewhere due to a bad connection or bad wire.Does anybody know where the hell is that heater wire & where it goes(& how can I recognize it)-The car is Uno DS,1.3, '88 year-(+ the manual says that there is no fuse for heater-If ther was, there wouldnt be yellow heater light at all, but there it is when you touch right thing & have luck in guessing)I don't have a clue what wire it could be.Please help Thanks in advance, Cuba
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