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Dash Light Power Pak

vman01

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I reviewed testing on the Dodge Charger Source Guide along with a number of documents on the subject.

My power Pak was tested on the bench with a 12V battery and produced 250v AC immediately at the white wire when hooked up but then the voltage drops about 1 volt every 2 -3 seconds or so until I unhooked it at 90v AC. During the testing the unit just gets noticeably warm and if I wait 3-4 minutes and hook it up again it will start again at ~250v AC and then starts to drop volts as previously noted (tried it 3 times).


Is this the capacitor causing the drop or is my transformer or a resistor shot? The writ-ups I reviewed identified replacement part numbers for the named components.

Thanks for your help
 
My power pack test just like yours. I replaced the capacitor and it fixed it. I got it from a place called antique radio supply. They do run pretty warm.
 
It is your capacitor that is causing the voltage drop. I use a Newark capacitor in my rebuilds for my Gauge Doc instrument cluster rebuild business:

Info below

Stock number: 66K5388
Part Number: 940C20S47K-F

Customer Part Number:
Description: CAPACITOR POLYPROPYLENE PP FILM 0.047UF, 2KV, 10%, AXIAL; Capacitance:0.047ÏF; Voltage Rating:2kV; Capacitor Dielectric Type:pP (Polypropylene); Capacitance Tolerance:ñ 10%; Product Range:940C Series; Capacitor Case Style:-
 
Thanks everyone,
I ordered 3 (I have 2 power paks to repair) of the capacitors identified above by Gibbers

Good to know there are still resources available and folks out there to help
 
Thanks everyone,
I ordered 3 (I have 2 power paks to repair) of the capacitors identified above by Gibbers

Good to know there are still resources available and folks out there to help
Glad to help!
 
I replaced the capacitor (Part 66k5388 Cornell Dubilier)

I ran Power Pak on the bench for 30 minutes and it is now putting out steady 324V AC. Unit ran from 116 degrees general temps with hot spot being the transformer at up to 145 degrees. Was expecting 230V output and before I replaced capacitor I had 250 tops then diminishing. Do I have another issue or is it still within acceptable limits?
 
I replaced the capacitor (Part 66k5388 Cornell Dubilier)

I ran Power Pak on the bench for 30 minutes and it is now putting out steady 324V AC. Unit ran from 116 degrees general temps with hot spot being the transformer at up to 145 degrees. Was expecting 230V output and before I replaced capacitor I had 250 tops then diminishing. Do I have another issue or is it still within acceptable limits?
Just to follow up and close out.
My gauges light up fine and the higher reading I posted earlier is due to using a volt meter vs an O-scope to check the output and with no load.
Thanks for all the help here and to Terry Hoover from the Charger Source site as well.
 
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