General lights and sound problem

[bilopapa]

howsit guys i have a fiat uno fire 1.1...im having problems with my lights and my sound. when i connect my sound it plays well when the car is off but once i start driving and i go over a bump the sound switches off and the lights flick...and when i put the radio on the oil light comes on bit very dim....any suggestions or help...i earthed the sound and the radio correct but it still does the samething...only when i put to earths on the radio the oil light goes off sound pumps good but that earth starts to get hot...any suggestions guys

 

[the green vanper]

Hello,

It seems there's a short somewhere.

Usually such problems are very hard to locate. I once spent more than month after work + on the weekends locating a short in an old Mazda. One by one eliminating the circuits that could not be the cause. I've checked loom by loom in the places where they could touch the body... So basically everywhere. Lifting the looms, checking and insulating, attaching with zip ties to where they were attached when the car left the factory almost 30 years earlier. Finally I was left with one circtuit running all the car long, so had lots of trims to dismantle. I started from the back and found the problem on the bottom of the central console. A 12V feed for an electric motor was passing behind a steel structure without extra room, so was being cut by the metal. The motor was rarely used and if so mostly when the car was stationnary, so there was no direct contact when there was power in it... Thus no fuse blown...

I'd say you should concentrate on two circuits first: the radio and the oli pressure sensor. And also the ECU wiring.

Good luck!

 

[bilopapa]

Hello,

It seems there's a short somewhere.

Usually such problems are very hard to locate. I once spent more than month after work + on the weekends locating a short in an old Mazda. One by one eliminating the circuits that could not be the cause. I've checked loom by loom in the places where they could touch the body... So basically everywhere. Lifting the looms, checking and insulating, attaching with zip ties to where they were attached when the car left the factory almost 30 years earlier. Finally I was left with one circtuit running all the car long, so had lots of trims to dismantle. I started from the back and found the problem on the bottom of the central console. A 12V feed for an electric motor was passing behind a steel structure without extra room, so was being cut by the metal. The motor was rarely used and if so mostly when the car was stationnary, so there was no direct contact when there was power in it... Thus no fuse blown...

I'd say you should concentrate on two circuits first: the radio and the oli pressure sensor. And also the ECU wiring.

Good luck!

thanx a million for the reply and i have been struggling for over 6 months...thanx bro

 

[the green vanper]

I'd say that the oil pressure light is the result, not the cause.

The radio 12V feed is shorting to ground somewhere, momentarily the voltage of the battery and the whole electrical system drops. Strange the radio fuse doesn't blow. Perhaps there isn't a fuse there or it is too big.

Shorts are dangerous, as potentially they could lead to a fire...

Check centimeter by centimeter the radio 12 V feed until you reach the other end of the wire. If you're not sure about it, disconnect it from the power and make a new feed protected by the correct fuse.

Is there a fusebox layout in the owner's manual. Is the radio connected to the correct fuse? While stationnary and the radio on, does it switch off when you take the appropriate fuse out?

 

[bilopapa]

howsit guys you wont believe what was the fault...it was the exhaust...lol...the exhaust was hanging and leaning on a metal piece thats part of the car which was causing all this havoc...once we lifted the exhaust from the metal piece all faults were gone....

 

[ZaphodB]

I'd check the main engine earth strap .....

 

[bilopapa]

will do thanx

 

[the green vanper]

I'd check the main engine earth strap .....

Earthing via the exhaust, why not