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Author Topic: voltage drop  (Read 1092 times)
chazwood
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« on: June 21, 2013, 03:16:14 PM »

Could there be anything, besides the 50dn alternator dropping a leg of the stator, that would account for a voltage drop of 4 volts (27 down to 23 with no big load) on my dash meter?
I'm hoping it's a relay or fuse or something that costs less than a new 50dn.
Hey, i can always dream.
We were coming back from a concert in MN, (going home to Al.) and about Chicago, my voltage dropped about three volts. We made it home without lights or air and it held steady at 23vlts (as long as you didn't hit the air cond.)

Is my 50dn toast?
or could something else cause this?
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Dave5Cs
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« Reply #1 on: June 21, 2013, 03:41:34 PM »

Bad Voltage regulator or a bad gauge. I am just trying to help ya out on the cost thing. Grin

Dave5Cs
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chazwood
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« Reply #2 on: June 21, 2013, 03:47:06 PM »

 Grin



 Angry
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luvrbus
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« Reply #3 on: June 21, 2013, 03:50:09 PM »

Check the belts first
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chazwood
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« Reply #4 on: June 22, 2013, 02:38:05 PM »

Started bus.
Opened back panel.
Tested post 49 .....24 volts.
Tested post 48....23.7 volts
Tested post 33.....04 volts.
I guess I have alternator problems Sad
Does anyone have a lead on who rebuilds 50dn's in the southeast?
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Lin
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« Reply #5 on: June 22, 2013, 03:34:11 PM »

I believe that our local auto electric shop does, so I would hope that one there would also.  Have you called any yet?
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Lee Bradley
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« Reply #6 on: June 22, 2013, 03:43:41 PM »

Bad diode? Might be able to fix that in place.
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bevans6
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« Reply #7 on: June 23, 2013, 02:52:55 PM »

That pin 33 voltage makes me think it's a bad diode.  If I have it right that voltage should be around 12 - 14.

That is the infamous R terminal...   Shocked

Brian
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chazwood
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« Reply #8 on: June 24, 2013, 09:24:12 AM »

I believe that our local auto electric shop does, so I would hope that one there would also.  Have you called any yet?
Got a quote from a local who said $1200 I think he just assumes he will replace everything.
Quote from: Lee Bradley
link=topic=25880.msg284086#msg284086 date=1371941021
Bad diode? Might be able to fix that in place.
Don't know about finding parts for this generator.
That pin 33 voltage makes me think it's a bad diode.  If I have it right that voltage should be around 12 - 14.
Yes, it should be around 12-14
Where can I get diodes for this thing?


That is the infamous R terminal...   Shocked

Brian
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chazwood
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« Reply #9 on: June 24, 2013, 09:25:37 AM »

Wow don't let me anywhere near the quote button. Hope you can make sense of my answers to those posts
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chazwood
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« Reply #10 on: June 24, 2013, 09:45:21 AM »

Bottom line is...where do you get parts for these things?
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bevans6
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« Reply #11 on: June 24, 2013, 10:37:24 AM »

I have dealt with these guys in the past.  http://www.elreg.com/Delco-Remy-50DN.html

There is a pretty complete diagnostic and repair section on the 50DN in the MCI manual here:  http://www.buses101.com/PDF_Files/MCI%209%20Maint%20Manual%20in%20PDF%20format/MC-9%20-%20Maint%20Manual%20Section%207.pdf

Brian
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1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
Spicer 8844 4 speed Zen meditation device
Vintage race cars -
1978 Lola T440 Formula Ford
1972 NTM MK-4 B/SR
luvrbus
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« Reply #12 on: June 24, 2013, 10:46:29 AM »

Check the diodes you need a 300ohms meter reverse the leads if below 300ohms they are bad
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