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Annoying Electrons

M MikelB Supporting Member

Having some charging issues with the "liitle car" and probably missing the obvious but after reading and testing I'm mentally constipated from the process.

 

Here goes, start the car and alt light is dimly lit and volt gauge reads a little over 12VDC. The B+ terminal reads about the same as the Volt meter and D+ is a little less than 12 @11.97. If I run the car up to 2k the output at B+ is 14.97 and D+ is 13 and the charge light gets brighter and stays that way as long as the engines off of idle. The battery is getting a little less 13 at this RPM as well. The problem is along with the light is that when my cooling fan comes on and I"m at idle the system is in a state of discharge as indicated by the volt meter at 10.5-11 volts and of course as RPMs increase the volt meter reads around 12.

 

I'm running a Motorola alternator with internal regulator which is new(regulator) and I believe its wired correctly i.e D+ back to indicator light( 2watt) and out of light through gauge and switched through ignition. The question I have is, should the exciter voltage at D+ get beyond the 12VDC reference (battery voltage)?

 

Also found alternator field is active (magnetized at pulley) with ignition on or off.

 

Thanks in advance, Michael

 

 

 

 

Last edited by Theron
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J justinh
Originally Posted by MikelB:

I'm running a Motorola alternator with internal regulator which is new(regulator) and I believe its wired correctly i.e D+ back to indicator light( 2watt) and out of light through gauge and switched through ignition. The question I have is, should the exciter voltage at D+ get beyond the 12VDC reference (battery voltage)?

When running, the B+ and D+ terminals on the alternator should output the same voltage.

 

Check your wiring between alternator and battery, both on the positive side and battery to chassis ground and chassis to transmission strap (should measure good continuity from battery- all the way to alternator case). A 2V drop between the two is unacceptable and is probably due to bad wire or loose or corroded connections. If your battery can't get full voltage from the alternator, the voltage difference between the battery+ (warning bulb+) and D+ (warning bulb-) will increase as the alternator voltage increases making the bulb brighter.

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