RobotMan 264 Report post Posted September 29, 2015 Does anyone have a bench top test procedure to activate the gauges at once or one at a time in the instrument cluster. I have disassembled the old cluster and am trying to determine if the gauges work. I am replacing the circuit board and voltage regulator. Thanks for your help. Rick Quote Share this post Link to post Share on other sites
Midlife 814 Report post Posted September 29, 2015 I do this routinely when I replace the circuit board with a dash cluster wiring harness. For the standard dash cluster connector, it is best to use alligator clips and a 12V supply. Your grounds need to be connected, the CVR input needs power (try a 9V DC battery), and briefly ground each gauge sending line. The gauge should peg to the high side. If no circuit card installed, apply 9V to one post and briefly ground the other post of the gauge. If nothing happens, reverse the leads. Quote Share this post Link to post Share on other sites
RobotMan 264 Report post Posted September 30, 2015 Thanks Randy. So I should be able to test each gage independently off the board just using a 9 bolt battery. Quote Share this post Link to post Share on other sites
Brian Conway 264 Report post Posted September 30, 2015 ...and, with no power anywhere, will a continuity test at each gauge be of any use ? Brian Quote Share this post Link to post Share on other sites
Midlife 814 Report post Posted September 30, 2015 A continuity test will only tell you if it the internal wiring is broken, but it is not a definitive test. The resistance is very low, just a few ohms. Quote Share this post Link to post Share on other sites
RobotMan 264 Report post Posted October 2, 2015 I took 2 1.5 v batteries and put them in series for a total of 3 volts. Touched them off on the gauges and watched them move. It was pretty cool to verify their function before reassembly. 1 DRASTiK reacted to this Quote Share this post Link to post Share on other sites
