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
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.