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#1
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over & under voltage sensing assembly
my parts catalog for '73-'80 P models shows part no. C593004-0101 for the description "sensing assembly-over & under voltage". To me it's not clear if this is for the circuit board or not. I have left the warning lights "dumby lights" and added the EI volt/amp meter for trouble shooting. I had rebuilt the warning board by replacing all the electrical components and attched a diagram with part numbers for the diodes and relays to an earlier post.
Dan ________ Buy Vaporizer Last edited by DBrugg : 03-22-11 at 12:51 AM. 
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#2
04-25-21, 09:53 AM
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Reed Relay
Hello all, does anyone have a current part number for the(2)REED RELAYs as shown on the "Schematic Alternator Warning" wiring diagram, drawing# 1571000 in the service manual? The part numbers (PN300-884-9944) on my relays are now obsolete.
I have called Don Nieser and several other sources without success so any help/ideas would be a greatly appricated. Thank you, BK
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#5
04-27-21, 02:33 PM
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alternator warning control board
Quote:
1-800-653-9909 Part#300-884 (x2). ($75 each, plus $17 shipping). www.relays-unlimited.com If you're going that far, recommend replacing the diodes and resistors too. There are a couple posts in the forum discussing the modern equivalent part numbers and sources. Last edited by Learjetter : 04-28-21 at 01:52 PM. Reason: added photos as requested
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#6
04-27-21, 04:43 PM
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Learjetter,
I placed an order with Computer Components but they only had 1 in stock with a 3 month wait for the second relay. I searched the web and found another for $225.00 along the 4 resisters at Wilco. Long story, but I also found a new surplus PC board for $175.00. After finding the board, I decided to make up a new unit and ordered all new diodes and the MS terminal boards. The only 2 items that I could not get in the correct part numbers were the fuse blocks and 7 position bottom terminal strip and, according to Cessna, they are no longer offered. That said, I found similar components with the same ratings and also have them on the way. I should have less than $700.00 total in parts for a new board. New surplus and "as removed boards" were running from $2,600.00 to $4,100.00 so, I'll have some fun and save a few coins. If you could post a photo of your board it would be great and thank you, BK
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#7
05-01-21, 01:00 AM
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This is incredibly useful info, thanks all. I'll likely need to do this on my 73G restoration. Would anyone be interested in an aftermarket cover for this unit? My cover is missing and I'll probably need to get some metal bent for it...may as well make a few.
Last edited by hayesjaj : 05-01-21 at 01:04 AM.
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#8
07-01-21, 06:31 PM
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Quote:
__________________
They can't stop the signal.
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#10
07-01-21, 08:41 PM
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Control Board
Thanks you for posting that information. I bought the 300-884 Relays a couple of months ago and they actually arrived yesterday. I bought the rectifiers and some diodes. I will use your list to collect the rest.
I have been thinking about why there would be so much trouble with these alternator lights if both regulators are set to the same voltage, either 27.7 or 28.8 volts. One possible area for this is since these are not paralleled in real time by the regulators, there is potential voltage drop from the rear to the front, thereby the incoming voltage from the rear would then be less that from the front. Just spitballing.
__________________
They can't stop the signal.
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