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post #1 of 5 Old 03-02-2019, 09:36 AM Thread Starter
mylestone
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Low voltage

I have a voltmeter in my CIG lighter and it reads 11.1 at idle and reving the engine with everything off! At the battery it get 13.9 everywhere. Inside I have trouble running the defrost blower and lights at the same time! Im getting 10.2 inside. But it starts fine. What did I miss?
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post #2 of 5 Old 03-03-2019, 06:01 PM Thread Starter
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I cleaned and tightened all contacts but as usual I discovered another issue. While driving I noticed the fan speed increasing and decreasing I thought I missed a wire somewhere. I noticed the idle stalling so I disconnected the battery then reconected it and instead of fixing the stalling I got a racing engine! To the tune of 2500 rpm no matter what Did! I disconected the battery again and the racing engine stopped and it got a normal idle without stalling. Could it be the cpu?? I replaced it years ago with a rebuilt unit but the id tag on the cpu wasn't anywhere to be found. It came with a lifetime warrenty but where do I send it to? I cant read the receipts as the ink faded to nothing. Just like all lifetime reciepts do. Is it the cpu causing the voltage drop for all the assories? What next! HELP
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post #3 of 5 Old 03-04-2019, 11:06 AM Thread Starter
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Newest issue I disconnected the battery to stop the 2500rpm idle it got after removing the
neg cable before to stop the stalling issue. It went back to a normal idle speed after that. But I'm still getting 14.7volts at the battery so my alternator works. But the CIG socket reads 10 volts at idle it does improve with rpm but not to the 14.8 I was getting. I disconnected the 3 cpu connectors and that didn't help but when it get home I'll spray the connectors with corrosion X to see if that helps. Any Ideas Alloro? New CPU. This one is 4 years old with a lifetime warrenty but the reciepts has faded to nothing readable. HELP!
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post #4 of 5 Old 07-10-2019, 11:22 AM
Mikey13
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Late reply but better late than...
I would assume that Dodge fixed this issue on newer models but...
On my 1973 B-100 the alternator does not put out enough current at low RPMs (mine set at 750 rpm) so I get a discharge
while idling and it gets worse if the headlights, blower motor... are on.
This was a know issue with many older Mopars,
Their are a few fixes for it including the use of a "one wire" GM or Nippondenso alternator.
Google "AMP gauges at the dash are troublesome" at mad electrical dot com.

If this is not your issue...
Try to measure a voltage drop (google "measuring DC voltage drop") across each mechanical connection on the circuit, the voltage drop will increase as the load on the circuit gets higher. A voltage drop will cause heat to build up at that connection which will cause the voltage drop to get worse over time.

Good Luck!
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post #5 of 5 Old 07-11-2019, 05:58 PM
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Since you've confirmed that the alternator works you need too find where in the wiring the issue is. You might have a
partial short or a badly corroded connection somewhere in the circuit that is supplying your dash. You need to inspect the interior of the fusebox/power center carefully as well. Also, pulling battery cables while the car is running is a VERY bad idea, it can burn out your alternator very quickly. I doubt this is a PCM problem, as your alternator is supplying correct voltage.
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