how to troubleshoot digital instuments 300zx

Asked by Dec 25, 2012 at 01:40 AM about the 1986 Nissan 300ZX 2 Dr STD

Question type: Maintenance & Repair

I own a Nissan300zx w digital display display,and doesn't work full time,and won't go into test mode,power supply
has been replaced 6 Times.same thing.bad Speedo head?

3 Answers


You could have a bad connector or broken etch on your digital display circuit board. With the display working (on) lightly push on the back of the display circuit board in several places (if you can reach it) & watch the display for changes. CAUTION: don't push hard. This could cause the display to permanently turn off.

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Best Answer Mark helpful

Car sat for many years, corrosion may be the issue.

I replaced the Speedo head w one I got on eBay for 100.00 plus shipping problem solved

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