Gauges not working

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Apr 7, 2021 | 12:27 PM

GrandpasOldF250

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Gauges not working

Over the last few weeks I noticed my fuel and temp gauge working intermittently (1972 F250 w/390, C6). My oil pressure gauge hasn't worked in years and my ammeter is useless with my 3G swap. Now the gauges aren't working at all. Does this sound like it could be the instrument cluster voltage regulator?

Apr 7, 2021 | 12:42 PM

smoky_diesel

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From: Chandler, AZ

Or the plug connection. Easy to diagnose, pull dash and;
1. wiggle connector.
2. ground the sensors.
3. measure regulator output.

Apr 7, 2021 | 01:46 PM

GrandpasOldF250

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Quote:

Originally Posted by smoky_diesel

Or the plug connection. Easy to diagnose, pull dash and;
1. wiggle connector.
2. ground the sensors.
3. measure regulator output.

Ended up being the connector that goes into the interment cluster. Still no luck on the oil pressure gauge. I'm pretty sure the gauge its self is dead.

Apr 7, 2021 | 06:48 PM

smoky_diesel

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From: Chandler, AZ

Try grounding the oil sending wire at the engine block and see if gauge responds. It should swing to 'H'.

Apr 7, 2021 | 11:20 PM

GrandpasOldF250

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Quote:

Originally Posted by smoky_diesel

Try grounding the oil sending wire at the engine block and see if gauge responds. It should swing to 'H'.

No luck on that, even hooked up the multimeter and it gave zero reading. I even cleaned off the contacts on the instrument cluster. At least I have a brand new high volume Melling oil pump.

Apr 8, 2021 | 11:02 AM

smoky_diesel

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From: Chandler, AZ

Could be the old oil soaked wiring from gauge. Probe the posts on the gauge itself. Should have 5 ish volts on both sides, ground the one that leaves the cluster. If no power at gauge the connection to the regulator may be broken on the cluster.