Re: Ebody sending unit wrong resistance value.
[Re: cudabitten]
#1691978
10/29/14 05:30 PM
10/29/14 05:30 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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make a long wire with alligator clips on each end & 1 end on the batt neg post and scrape other end on sender flat circular metal & see if you have continuity all the way up front. You wouldn't wanna increase voltage. A parallel circuit would not reduce voltage (think of Nacho's bulkhead parallel bypass or visualize the drive around lanes on either side of the main checkpoint at a border crossing. You'd wanna resistor in series (in the blue wire if we're on the same page) but I think it'd be a nightmare of experimentation to get the right resistor but I dont know electronics so no firsthand experience. I kept my 5/16 sender which worked fine & soldered in a bung in the bottom of the tank for enough flow for my app (my adv was I had a new Spectra tank). EDIT on second thought a resistor in the blue line to ground WOULD reduce voltage that the sender sees
Last edited by RapidRobert; 10/29/14 05:39 PM.
live every 24 hour block of time like it's your last day on earth
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Re: Ebody sending unit wrong resistance value.
[Re: cudabitten]
#1691980
10/29/14 06:15 PM
10/29/14 06:15 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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I've heard nothing but bad regarding aftermarket sending units. You might talk to an electronics whiz. A guy directed me to call a guy at the local Radio Shack (on an unrelated issue) who is sharp on that stuff. A similar plan might work for you but I gotta feeling that it'll be alot of experimenting ahead of you. Holler how it (all) turns out. EDIT If I had my druthers I'd want it dead on at the lower end of the scale as I dont like hitchhiking
Last edited by RapidRobert; 10/29/14 06:17 PM.
live every 24 hour block of time like it's your last day on earth
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Re: Ebody sending unit wrong resistance value.
[Re: 71birdJ68]
#1691983
10/29/14 10:46 PM
10/29/14 10:46 PM
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Joined: Jan 2004
Posts: 755 Tempe, AZ
loco340cuda
super stock
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super stock
Joined: Jan 2004
Posts: 755
Tempe, AZ
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If the resistance is changing with the fuel level (assuming a linear resistance change) and you add a fixed resistance in parallel to this variable resistance then the combined resistance will be non-linear.
70 Cuda 340 4 speed - now stroked to 416ci (SOLD) 2017 Mustang Shelby GT350
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Re: Ebody sending unit wrong resistance value.
[Re: 71birdJ68]
#1691985
10/30/14 12:08 PM
10/30/14 12:08 PM
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Joined: Jun 2008
Posts: 1,822 Colorado
denfireguy
top fuel
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top fuel
Joined: Jun 2008
Posts: 1,822
Colorado
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Quote:
Dixie has sending units made by the original vender, send that one back, and get the real thing from them.
That is what I would do as well for two reasons: 1) to get an accurate reading 2) Support someone who has gone to the trouble of trying to supply good stuff to the hobby.
As for being linear with a resistor in parallel, none of the 70s era Mopars I owned were terribly linear from the factory. Either the gauge plummeted to half tank and then took longer to get to empty or they took forever to get to half tank and then plummeted from there. You just have to get to know your gauge and what it means. The factory on in the Cuda never did go to full when it was filled and it still has a couple of gallons in it when it says empty, which is good. Craig
2014 Ram 1500 Laramie, 73 Cuda Previous mopars: 62 Valiant, 65 Fury III, 68 Fury III, 72 Satellite, 74 Satellite, 89 Acclaim, 98 Caravan, 2003 Durango Only previous Non-Mopar: Schwinn Tornado
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Re: Ebody sending unit wrong resistance value.
[Re: denfireguy]
#1691986
10/30/14 12:49 PM
10/30/14 12:49 PM
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Joined: Nov 2003
Posts: 12,493 Western Colorado High Desert
moparmarks
I Live Here
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I Live Here
Joined: Nov 2003
Posts: 12,493
Western Colorado High Desert
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I've been going through the same thing. Just got a Mancini unit and it reads 9-84ohms. Going to install it today and hope it works. Dixie just shows the 5/16" unit and I need a 3/8" with 1/4" return.
72 Satellite Sebring Plus 440, 72 Dart 5.9 4-spd, 68 Valiant, 73 W200, 78 D100 sb, 78 D200, 98 DAKOTA, . Moparmarks Parts & Restorations Desert Mopar Metal Grand Jct. CO 970-261-7039 http://moparmark.com/motormangj@gmail.com
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Re: Ebody sending unit wrong resistance value.
[Re: moparmarks]
#1691987
10/30/14 10:33 PM
10/30/14 10:33 PM
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Joined: May 2008
Posts: 958 eastern, pa.
cudabitten
OP
super stock
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OP
super stock
Joined: May 2008
Posts: 958
eastern, pa.
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I will consider the two venders listed here in this thread. I never even thought about the resistance value when I bought this unit over a year ago. My fault, I listened to someone, not here, about going to a 3/8 line instead of the factory 5/16. I'm thinking that is where I went wrong. I also had to adapt the carb end. My application is on a 74 cuda. One of the only things I bought wrong for the restore though, so I'm ok.
Last edited by cudabitten; 10/30/14 10:45 PM.
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