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Is trying to fix this card worth messing with?

rdc0000

New member
15
15
3
Location
NM
It could be the PO just shorted out something to cause the unknown resistor to blow. Can someone tell me what the resistor is so that I could test the board? I do plan on having a manual momentary GP relay switch in the truck. I would also like to know what usually dies on these cards. The controller chip? Regulator? This is my first CUCV. Plus I need to get my post count up so I can communicate Lol.
 

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ezgn

Well-known member
650
1,039
93
Location
Lake Elsinore Ca.
It could be the PO just shorted out something to cause the unknown resistor to blow. Can someone tell me what the resistor is so that I could test the board? I do plan on having a manual momentary GP relay switch in the truck. I would also like to know what usually dies on these cards. The controller chip? Regulator? This is my first CUCV. Plus I need to get my post count up so I can communicate Lol.
The card is burnt all the way into the board. A new updated card would be a better way to go in my opinion. Get one from member antennaclimber on this site.
 

als804

Member
89
66
18
Location
kimcheon, ROK
i had the same problem. i just changed DIODE only and then it works perfect till now. Try to change diode ! i did use 1N4007 which is not the same as original one but it works. pattern in your picture looks burnt. if it is you have to connect them manually

the below i had experienced.
IMG_5731.jpg
IMG_5730.jpg
 
Last edited:

Keith_J

Well-known member
3,657
1,323
113
Location
Schertz TX
Yes, it is a diode and the cathode band is still visible in the charred example. This connects the transistor emitter to the solenoid so when the glow plug action is commanded, the transistor grounds out the solenoid, the other coil connection is 12 V+. The diode protects the emitter from back EMF because when the solenoid is switched off, a strong positive voltage is generated by the coil as the magnetic field collapses.
 
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