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Another Seemingly Mysterious Issue w/My 1993 Volvo 940 Wagon 900

posted by  onlyVolvo on  Sun May 5 14:41 CST 2019
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last visit: Thu Jun 26 20:57 CST 2014
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Respectfully asking for your input...

When attempting to start my 940 this weekend, the starter motor cranked very slowly and I was unable to start the car. Yesterday, it had started and ran reasonably well however, after 30 minutes of running and shutting it down, the engine did not crank at all when I attempted to restart it. Today, it cranked very slowly and not sufficiently to start. I thought that it simply was a bad battery. I checked the battery with my voltmeter and much to my surprise, the voltage exceeded the normal range and measured between 15.6 and 16.2 volts! I have experienced several bad batteries in the past (suffering from low voltage) but I have never seen a high voltage situation. Could this be indicative of a bad voltage regulator within the alternator? If the voltage is high, wouldn't that be sufficient to crank the starter motor? (Unless the starter motor is coincidentally bad as well...) I also checked by on board diagnostic on the 940. The code readout was 1-3-2 which is 'Low voltage'. Before going to the major expense of replacing both the alternator and starter motor, I would appreciate any advice.

Many thanks!!

OnlyVolvo








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Another Seemingly Mysterious Issue w/My 1993 Volvo 940 Wagon 900

posted by  Oleseahorse on  Fri May 17 04:18 CST 2019
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last visit: Fri Oct 24 11:45 CST 2014
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Get one of these. Very handy. Lots of 'em on eBay

https://www.ebay.com/itm/3-1A-USB-Dual-Ports-Car-Cigarette-Lighter-Charger-12V-24V-Digital-LED-Voltmeter/223488431036?hash=item3408f2d3bc:m:m-WBpFY4soMUeqijlI0o-_g:sc:USPSFirstClass!08741!US!-1








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Another Seemingly Mysterious Issue w/My 1993 Volvo 940 Wagon 900

posted by  Amarin on  Sun May 5 15:28 CST 2019
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last visit: Thu Oct 23 22:42 CST 2014
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Try cleaning the wire posts at battery and starter. Disconnect and wire brush the connections. At the starter solenoid, the top wire is to battery, middle to ignition switch and bottom to starter motor. Clean the bottom post too. This has always been overlooked during starter maintenance. Also include cleaning the main chassis ground wire near the battery.

If you suspect failing battery test by turning on the headlights (ignition key at KPII) after doing the above. Alternatively a carbon pile tester is needed to test battery.

Amarin.








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Another Seemingly Mysterious Issue w/My 1993 Volvo 940 Wagon 900

posted by  Blindboy on  Thu May 16 20:06 CST 2019
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last visit: Tue Oct 21 17:56 CST 2014
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mY GUESS ISTHE BRUSHES ON YOUR STARTER ARE WORN OUT.








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Another Seemingly Mysterious Issue w/My 1993 Volvo 940 Wagon 900

posted by  spook on  Sun May 5 14:48 CST 2019
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last visit: Fri Oct 24 08:06 CST 2014
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Dear OnlyVolvo,

Hope you're well. Code 1-3-2 signals voltage too low or too high.

How old is the battery (months)? How old is the alternator (miles)?

A 12-volt battery that "reports" 15+ volts likely has failed.

What is the alternator's output? It should not much exceed 14.4 volts.

Hope this helps.

Yours faithfully,

Spook







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