Does anyone have a preferred way to bench test the instrument cluster? 68 Dart, I'd like to start by checking the lights and illumination. What power source would be best?
I didn't test lights and illumination. I guess I had no concerns there other than bulbs and bulb holders.
I did test gages using all the methods recommended. First check for resistance in the gage. The used some D Cells in series to check response to 3 or 4.5 volts. Finally hooked up resistors to represent sending unit resistance, and then used a car battery to power the IVR and see how the gages responded to low, mid and high resistance.
I found a replacement oil gauge the guy wants $50 for it. He tested it for continuity. But before I buy it I'm bringing my multi reader. Testing the ohms. I'll see if he will let me pop the lid off it too.
Hey Guys, I did a search on the forums and found similar threads and advice. It was all greek to me. Simple question. How do I power up the backlights on the gauge cluster to test and make sure I have em all oriented right and everything is working right?
Going well so far. Started out by checking the housing to circuit board trace ground screws, not so good. Removed screws and gave traces the De-Oxit and Q-tip treatment until good continuity on the meter. Next the bulbs and holders. One broken holder, replaced with spare. I'll replace all of the GE 158's when I get some. Cleaned bulb traces and contacts with De-Oxit again, good stuff!
The nuts on the fuel/temp gauge posts were surprisingly loose, age I suppose. Cleaned and got good continuity from the pins to the posts. While gauges were disconnected from the trace they both read about 12.5 ohms. Ammeter nuts were loose on the posts also, cleaned and snugged up.
Flashlight battery test next, then find some resistors.