Help With New Instrument Cluster, please

[pjmoreland]

Yes on the voltage test.

For the continuity test, I thought about some more, and it would be better to measure resistance between the tan wire post on the gauge and the ground post. This should be done with the ignition off. You should get somewhere in the ballpark of 45 Ohms (maybe less), depending on the position of your sender. I would also take this same measurement with the brown wire disconnected from the sender. The resistance should be close to 100 ohms.

[Zonaman]

Originally Posted by pjmoreland

Yes on the voltage test.

For the continuity test, I thought about some more, and it would be better to measure resistance between the tan wire post on the gauge and the ground post. This should be done with the ignition off. You should get somewhere in the ballpark of 45 Ohms (maybe less), depending on the position of your sender. I would also take this same measurement with the brown wire disconnected from the sender. The resistance should be close to 100 ohms.

The tan post to ground on back of gauge key off read about 57 Ohms. There's only a tan wire on the sender no brown did you mean that I should disconnect that one at the sender and repeat the same test ?

[pjmoreland]

Originally Posted by Zonaman

The tan post to ground on back of gauge key off read about 57 Ohms. There's only a tan wire on the sender no brown did you mean that I should disconnect that one at the sender and repeat the same test ?

Yes, sorry, tan disconnected at sender

[Zonaman]

OK my turn to mess up. The first reading was with tan wire off sending unit. It read 33 Ohms wire on. that's on my Cen-Tech meter set to 200 in the Ohms section.

Here's what else I know:

Fuel Gauge Circuit Tests
New Instrument cluster, new fuel sending unit. Condition key off: gauge needle 9 o’clock (off top scale). Key on gauge needle moves toward 10 o’clock position.
• Battery: Good
• Fuses continuity: Good
• Wire (tan) continuity from sending unit to fuel gauge fuse block: Good
• Ground at instrument cluster : Good
• Ground from cluster wiring harness to cab: Good
• Ground at sending unit on tank: Good
• Tan wire off post at tank, key on: gauge does not move from 10 o’clock.
• Tan wire on full ground, key on: gauge does not move from 10 o’clock.
• OHMS at new sending unit installed in tank (approx. half tank of fuel): 44