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is the alternator bad or is it the voltage regulator??

Posted By texasmark1 13 Years Ago
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texasmark1
Posted 13 Years Ago
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Supercharged

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First real miles driven tonight on son's Monterey; to church and back. Lights got dimmer and dimmer, turn signals stopped working...

how about some pointers on checking out the voltage regulator? I know how to check the battery and alternator with a volt meter, but am clueless on how to test the voltage regulator...

thanks,Mark

"God Bless Texas"location: Houston,TX

Grizzly
Posted 13 Years Ago
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Mark,

I love hearing about your posts the the progress with your sons car. If you understand checking battery and alt with  a multimeter I would suggest two things.

First check your grounds. The issues that you have pointed to with corrosion problems suggest that this could follow through to grounds. 

Then if battery, alt (stator and rotor) and grounds are right by default. An alternator will have both regulator and rectifier. Diods and conection and should be easily checked with a good multimeter. Check and eliminate by defalt.

I thought that this era Merc sould still be running a generator?

Cheers

Warren

    

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texasmark1
Posted 13 Years Ago
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thanks for the suggestions... Grounds should be good as we have cleaned up all the wires in the system, but they bear one more look-see; and we'll check the other items you mentioned.

this year has an alternator, but also a voltabe regulator as well as an instrument panel voltage regulator...

thanks again, Mark

"God Bless Texas"location: Houston,TX

bergmanj
Posted 13 Years Ago
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TexasmarkI,

Another thought: Take regulator and alternator out & take to an auto parts store where they have "free" testing; probably easier than "hunting" around; and, will either give you definitive answers, or eliminate those parts as being the cause of the issues.

Me, I'd probably keep "hunting" for my own satisfaction; but, it'll probably be a better use of time to get them tested; I just need to keep learning that lesson!

Regards,   JLB

55 Ford Crown Victoria Steel Top



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