74 Sonett Fuel Sender Tips - Saab Sonett Bulletin Board - Saabnet.com
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74 Sonett Fuel Sender Tips
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Posted by Blade2085 (more from Blade2085) on Tue, 7 Apr 2009 15:34:03 Share Post by Email
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Here is some information that we learned on the sending unit

Fuel sending unit uses three wires:
black for ground - tank to body
brown for low level light - W terminal
gray for the level - terminal G

Gas Guage test:
Pull gray wire, leave it open, and turn on key, gauge should show full
Ground gray wire and turn on key, guage should show empty
Pull and ground brown wire, turn on key and red low fuel light come on

Hook 1K, 10 turn resistor between gray wire and ground. At 10 ohms the gas guage should just start to move, turn it up to 200 ohms it should peg at full.

Sender test:
Pull gray wire from G terminal on sender and leave open
Empty tank should read about 10 ohms, meter connected to ground and "G"
Full tank should read about 200 ohms, meter connected to ground and "G"
Level in between should be 10 to 200 ohms

Palo Alto couldn't easily determine the ohms from the level sender data punched into the top of it. This is why Adam and I used the resistor to tell them the actual values. They believe a 10-180 ohm unit will work. The manual listed two part number so maybe some gauges are different.

It looks like the low level warning is some type of contact switch to that when the level is low the brown wire grounds which in turn lights the red low level light.

74 Sonett Blog

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