AC 175 fuel gauge and sender ohms

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   Does anyone know what the correct ohm range should be for an AC 175 fuel sending unit? I just bought a sending unit from All States Ag. The sender has the correct Agco part number stamped into it, so I'm assuming the correct unit was sent. I put an accurate ohm meter on it and it reads approximately 4 ohms empty and 39 ohms full. The gauge I have appears to be an AC OEM, its a Faria brand, but it has 3 terminals and I think the original only had 2 terminals, so I think its a replacement. The gauge instantly reads beyond full when the key is turned on. I'm hooking the wire from the sending unit to the center terminal on the gauge, when hooking the sending wire to the other terminal then nothing happens.It appears the ohm range on the gauge doesn't match the ohm range on the sending unit.

Thanks

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bozrae Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 02 Jul 2012 Location: Michigan Points: 165	Post Options Post Reply Quote bozrae Report Post Thanks(0) Quote Reply Topic: AC 175 fuel gauge and sender ohms Posted: 03 Oct 2018 at 1:00pm
	Does anyone know what the correct ohm range should be for an AC 175 fuel sending unit? I just bought a sending unit from All States Ag. The sender has the correct Agco part number stamped into it, so I'm assuming the correct unit was sent. I put an accurate ohm meter on it and it reads approximately 4 ohms empty and 39 ohms full. The gauge I have appears to be an AC OEM, its a Faria brand, but it has 3 terminals and I think the original only had 2 terminals, so I think its a replacement. The gauge instantly reads beyond full when the key is turned on. I'm hooking the wire from the sending unit to the center terminal on the gauge, when hooking the sending wire to the other terminal then nothing happens. It appears the ohm range on the gauge doesn't match the ohm range on the sending unit. Thanks
	D15D, D17G, 170G, 175D, and two 5050FWA

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JC-WI Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 11 Sep 2009 Location: wisconsin Points: 34224	Post Options Post Reply Quote JC-WI Report Post Thanks(0) Quote Reply Posted: 03 Oct 2018 at 1:20pm
	240-33 ohm gauge. ebay... sender and gauge http://www.ebay.com/itm/NEW-Fuel-Level-Gauge-with-Sender-2-1-16-Inch-Black-w-Chrome-Bezel-240-33-Ohm/302194528992?hash=item465c3292e0:g:adAAAOSw5cNYd~FA:sc:USPSPriority!54840!US!-1 sender http://www.ebay.com/itm/Universal-Fuel-level-sender-sending-unit-240-33-ohms-fits-tank-depths-of-5-27/312237037055?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D20160323102634%26meid%3D6637ae3ce8eb4bd9aed5e3f561687b07%26pid%3D100623%26rk%3D4%26rkt%3D6%26sd%3D302194528992%26itm%3D312237037055&_trksid=p2047675.c100623.m-1 NAPA... fuel gauge kit http://www.napaonline.com/en/p/BK_5011742
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bozrae Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 02 Jul 2012 Location: Michigan Points: 165	Post Options Post Reply Quote bozrae Report Post Thanks(0) Quote Reply Posted: 03 Oct 2018 at 3:05pm
	Thanks for the links to gauges and senders. I may end up going that route if I cant get this resolved. I'd like to keep them close to original if I can. I did see on eBay there are some gauges for an AC 175 with an ohm rating of 5 to 37, that is very close to what my sender is. These look to be cheap gauges from China or India though.
	D15D, D17G, 170G, 175D, and two 5050FWA

Alvin M Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 24 Jun 2018 Location: PA Points: 792	Post Options Post Reply Quote Alvin M Report Post Thanks(0) Quote Reply Posted: 03 Oct 2018 at 4:04pm
	You need to ground the gauge. put wire from lower post to ground . left post to sender

bozrae Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 02 Jul 2012 Location: Michigan Points: 165	Post Options Post Reply Quote bozrae Report Post Thanks(0) Quote Reply Posted: 04 Oct 2018 at 6:48am
	Thanks Alvin, wiring the gauge as you described made it work. The gauge doesn't fully read empty when the sending unit is at it's lowest point. It's reads just under 1/8 of a tank, but I'm okay with that.
	D15D, D17G, 170G, 175D, and two 5050FWA