electrical guys can you help me with my alternator

[MVGhia]

so I have a 58 ghia and recently my bosch alternator with an external regulator went out. I have another alternator with an internal regulator that I switched to. here is my problem, I have the new alternator hooked up and wired and it charges now. my problem is when I turn my ignition off the car still runs, only when I unplug the idiot light from the D+ does it turn off. the idiot light wire does not have power until I turn my ignition on. so my question is, what do I need to do/change to get my car to work properly? thanks for any help

[widefivebug]

Its called "engine run on" and it sometimes happens with alternator conversions. I had the same problem. See attached link.

https://www.thesamba.com/vw/forum/viewtopic.php?t=647932&highlight=diode

[Dale M.]

[kreemoweet]

Sometime using a warning lite bulb with a too-high wattage rating can cause that. Stock bulb size was 1.2W as I recall.
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[MVGhia]

Thanks for the help guys. So is there a certain size/wattage or anything I need to know? It looks like Frys sells them so I'm going to check them out today.

[Dale M.]

[Luft kühl]

Using a diode is not the way to correct the problem. The diode will prevent the light from warning you should an overcharging situation ever occur. Overcharging can destroy your battery, stereo, and other electronic devices you may have.

The proper size for the warning light bulb is 2 watts.

[Dale M.]

[Luft kühl]

That depends. I would need to ask some questions first.

Lets wait for his reply.

[MVGhia]

So o went to frys and saw "zenner diodes are these the same as an isolation diode? It is measured in voltage and PD. Voltage was 24v and PD was 5w. Is this what I need or something else?

[Dale M.]

You want "general purpose" rectifier diode...

Look for this one...

http://frys.com/product/1808696?site=sr:SEARCH:MAIN_RSLT_PG

Dale
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[MVGhia]

I'm going to go back to frys and check out that diode. Last week a buddy who knows more about electronics recommended a 1n5401 diode. I got it today and it did not work. This isbthe diode on Amazon if this gives you any info. https://www.amazon.com/gp/aw/d/B006ACRL8Q/ref=mp_s...ref=plSrch

[widefivebug]

This is what I'm using and it works fine. Be sure the orientation is correct.

https://www.amazon.com/FAIRCHILD-SEMICONDUCTOR-1N4...+pieces%29

[Dale M.]

[Dale M.]

[MVGhia]

I originally placed the gray stripe towards the D+ and nothing happened so I reversed it and still nothing happened. I checked the voltage on the alternator and it wasn't charging. I bought a 5 pack of those diodes so i'll try another. so with this option still not working what is the next move if the other diodes don't work either?

thanks

[Luft kühl]

[MVGhia]

so i am hoping to resurrect this thread because i havent driven my car much but i still have my charging issue. i've tried the diodes with no help. someone here mentioned a 2 watt bulb. i see so cal parts has 6v and 12v bulbs, not sure if either would work.

i am also considering buying a new alternator as well. when i jump the B+ to the D+ the alternator will charge the battery. however, leaving that connected kills the battery. is it possible the internal regulator on my motorola alternator is bad? this is why i am considering a new alternator.

[Dale M.]

[MVGhia]

here is a picture of my alternator. isnt the white box on top the regulator?