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sprocket

944 headlights are flickering at idle

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Hello. 

 

my 87 944s has a small annoying issue.  my lights flicker when it's at idle and when I rev up they are fine.  is this a simple issue or a sign that something is failing.

 

thanks.

 

Roch.

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Is your voltmeter accurate? I don't think you can get 13v with the engine off. If it's accurate 15 and 16v are way above the proper charging voltage (13.5-14.5v).

 

You may want to have you battery tested first.

Edited by Ahsai

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The voltmeter is brand new.  But I have to admit, I'm not very knowledgeable when it come to electronics.  Do the other numbers make sense?

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You need to set it to a range that is larger than the expected measurement. DC like Loren said. In this case it's 50v. Is it a digital meter? We also need the first decimal reading. E.g., 12.1v vs 12.7v makes a huge difference. A photo of the meter dial might help.

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Wow, reminds me of what I used for my childhood electronic projects :)

 

Sorry to say but this meter won't be accurate enough for this diagnostic purpose. Digital meters are very accurate and affordable these days. This one is nice because it can measure voltage and current drain by clamping the meter around the battery cables. No need to disconnect any circuits.

 

https://www.amazon.com/gp/aw/d/B00O1Q2HOQ/ref=mp_s_a_1_2?ie=UTF8&qid=1500248733&sr=8-2&pi=AC_SX236_SY340_FMwebp_QL65&keywords=dc+current+clamp+meter&dpPl=1&dpID=41sD0XebR4L&ref=plSrch

 

 

 

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This one has a slightly better spec (0.7% accuracy).

 

Re your problem. Have you checked if your battery cables are tight and corrosion free?

 

https://www.amazon.com/gp/aw/d/B00O0HLBJ8/ref=mp_s_a_1_4?ie=UTF8&qid=1500248733&sr=8-4&pi=AC_SX236_SY340_FMwebp_QL65&keywords=dc+current+clamp+meter&dpPl=1&dpID=417d7jMeCYL&ref=plSrch

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Yes.  They are tight and corrosion free.  Someone mentioned maybe a ground wire?  Not sure what I'm looking for in that case or where?

 

R.

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This one looks like the one from the engine to the chassis. The other major one is the one from the battery to the chassis.

 

I still recommend starting with checking the battery and the charging system first amd see if they are healthy first.

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Saw that you're in Canada but probably it's the same there. In US here, you can bring your battery to any auto parts stores (that sell batteries) and have them load test your battery. Having the right multimeter is a start but it's in no way a guarantee to be successful. Electrical troubleshooting does require basic electrical knowledge.

 

With a good multimeter, at least you can check the charging system. If you're not comfortable with any of these, taking it to a good garage will be the best solution.

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For reference, the battery should measure 12.5 to 12.7v when the car is off.

When the engine is running and maybe with some load such as headlights and a/c, the voltage at the battery should be between 13.5v to 14.5v at all times at any rpm.

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So when the car is off it's measuring 12.77....with engine running it's fluctuating between 15.24 and 15.68.  Then with lights on it's fluctuating from 14.98 and 16.04.  It wouldn't hold a steady number.  Thoughts?

 

R

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This is for a 951...  is the procedure the same for  944S?  Could I do this myself?  I've changed fuel pressure regulator, coolant tank, speedo gears, dash lights.  I'm no to bad with wrenches...  and the big question is: Is the voltage regulator the real issue?  Or should I do other things before I tear into it?

 

Thanks.

 

R

 

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