Question about 2005 Suzuki Swift

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Everytime the car is started hot or cold the alternator belt screems momentary and goes away. the car has a new battery fitted and the alternator has had new bearings,regulator,diode module (four pin reg) Voltage across positive at alternator pos terminal to earth chassis is 14.2V as it should even though when the belt is screeming so appears that current load across alternator is overloading the mechanical output of the microbelt can cope with.The belt is tight on pulleys. I believe the the fourth wire from the plug at the alternator i think is connected to the Vecu Fr wire and its function is drop load off the alternator when full throttle is applied to give small but extra HP to the engine when required. If this wire is cut to the Vecu would this remove the belt squeel when first starting up or do you know off hand what the problem may this case.2005 Suzuki Swift 1500 Auto. EMU906

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I would first try replacing the belt. These normally last about 5 to 7 years. It may be somewhat glazed, allowing it to slip under load. If that does not work, you might need to replace the tensioner pulley.

Posted on Nov 11, 2010


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I just buought a 98 Volvo S70 T5, the car sat for abit, to the point were It had to jump it. to start. ran great for the next 2 hours off and on mybe 7 diffrent starts but it never running for more then...

It could be a number of things:
  • Bad connection or corrosion on battery cables
  • Dead cell in the battery would prevent it from charging fully
  • Bad or worn drive belt would slip, preventing the alternator from fully charging the battery
  • Bad alternator
If the car will run at idle with all accessories turned on, the alternator is good and you should concentrate on the battery and battery cables. If the car won't idle, then the drive belt and/or alternator could be the issue. If the car starts everytime when it's cold and only gives you a problem starting when the engine is hot, the starter could be the issue. A bad starter will often work when it's cold (after sitting a few hours or overnight). When a bad starter gets hot, it takes more and more power to get it to turn over.
Overall, I'd have the electrical system checked out. Most chain auto parts stores (Autozone, Advance Auto) will do a complimentary electrical test for you.

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Short duration screech when car is started. Last longer in cold weather. Had top two belts replaced within last 24 months. apparently there are three belts.

One of the belts is loose. I would say it is the Alternator Belt.
What happens is that when you use the battery to start the car, the alternator immediately attempts to charge the battery back up once the car starts.
If the belt is loose, the belts slips some, making that horrible screech, until the battery is charged enough that the belt no longer slips, because the alternator no longer needs to make as much power, and the screech goes away.

Check to see that your alternator belt is the next one to replace, and tighten it up to specs.

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It can be also due to poor belt or tightness. When the engine is cold pour some water over the belt , if the noise goes off then the belt can be a suspect. Also you can use a candle to rub wax on the edge of the belt and then start the engine, if there is no noise then the belt can be a suspect.
If not check on the IDLER pulley or the bearings in the water pump/alternator.
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It could be as simple as a loose or worn alternator belt that needs replacement or the cars charging system is not putting enough charge back into the battery under normal running so when first started in the morning the battery requires more power from the alternator which in turn puts more load on the alternator belt, Get the belt checked first then get the battery and charging checked, the first item being the cheapest to repair. Hope this helps.

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