Chance Posted January 5 Report Share Posted January 5 so I bought a new sending unit and it only reads to a bit less than halfway and goes down from there. here's a picture tanks around 90% full. Quote Link to comment
datzenmike Posted January 5 Report Share Posted January 5 1/ Does your temperature gauge read correctly???? If YES go to 2/ ... (If NO let me know) 2/ Ground the Yellow wire that goes from the gauge to the sender. Gauge should read FULL. 2a/ If it doesn't read FULL, then the gauge is at fault. 2b/ If it does read FULL then... 2c/ your sender in the tank is faulty or... 2d/ the Black ground wire is at fault or fallen off or hit with rock and broken. 1 Quote Link to comment
Chance Posted January 5 Author Report Share Posted January 5 21 minutes ago, datzenmike said: 1/ Does your temperature gauge read correctly???? If YES go to 2/ ... (If NO let me know) 2/ Ground the Yellow wire that goes from the gauge to the sender. Gauge should read FULL. 2a/ If it doesn't read FULL, then the gauge is at fault. 2b/ If it does read FULL then... 2c/ your sender in the tank is faulty or... 2d/ the Black ground wire is at fault or fallen off or hit with rock and broken. so I bought an oem one that doesn't have the ground stud on the top like the original one I grounded the yellow to the old one and gauge is working great. could the no ground on the new one be causing it to read only halfway? if it helps the gauge reads very slowly. Quote Link to comment
Chance Posted January 5 Author Report Share Posted January 5 almost positive that it just needs a ground ohms look good on the sending unit. I'm thinking best solution is to find a circle ground like this and solder it to the top of the sending unit. only problem I don't know where to find a connection like that. does anyone know what its called or where to find? Thanks Quote Link to comment
datzenmike Posted January 6 Report Share Posted January 6 Yeah the rubber O ring may be isolating the sender from the grounded tank body. Or the tank may not actually be properly grounded. Quote Link to comment
Chance Posted January 6 Author Report Share Posted January 6 12 minutes ago, datzenmike said: Yeah the rubber O ring may be isolating the sender from the grounded tank body. Or the tank may not actually be properly grounded. that's the power tab, it seems to only read when I put the negative lead on the top of the sending unit that's why I was thinking to add a ground "stud" on top to connect the ground wire to it I tried using a nail but soldering isn't sticking Quote Link to comment
datzenmike Posted January 6 Report Share Posted January 6 The tightening ring that you hammer on should ground the sender to the tank body. Take it off and make sure it's free of any rust. If that doesn't work, hold a ground against the tank it may not be properly grounded. Quote Link to comment
Chance Posted January 6 Author Report Share Posted January 6 51 minutes ago, datzenmike said: The tightening ring that you hammer on should ground the sender to the tank body. Take it off and make sure it's free of any rust. If that doesn't work, hold a ground against the tank it may not be properly grounded. I got a brand new ring for it, went to go check to see if I got a reading on the multi meter on the tank and I got nothing. although i'm thinking the secondary ground wire for the sending unit would ground the tank? Quote Link to comment
datzenmike Posted January 6 Report Share Posted January 6 Yes it would if you can find a mounting bolt. Quote Link to comment
Chance Posted January 6 Author Report Share Posted January 6 I just need to figure out how to put a ground stud on the sending unit. any ideas would be appreciated Quote Link to comment
Crashtd420 Posted January 6 Report Share Posted January 6 6 hours ago, Chance said: I just need to figure out how to put a ground stud on the sending unit. any ideas would be appreciated How about drilling a really small hole... And using just nut and bolt a ring terminal... Quote Link to comment
datzenmike Posted January 6 Report Share Posted January 6 The sender should ground through the tank it's clamped to. As the tank is mechanically bolted to the box probably you could just connect a ground to it first and see if it starts reading. I don't like the idea of drilling on the tank itself. The box itself is rubber isolated from the grounded frame. Quote Link to comment
Chance Posted January 6 Author Report Share Posted January 6 the problem come on how to do that. Quote Link to comment
bilzbobaggins Posted January 6 Report Share Posted January 6 self tapping screw would work 1 Quote Link to comment
wayno Posted January 6 Report Share Posted January 6 Sand that positive post clean of black paint on the sender and test. Quote Link to comment
Chance Posted January 7 Author Report Share Posted January 7 3 hours ago, wayno said: Sand that positive post clean of black paint on the sender and test. no paint on it, just need it grounded I got alligator clips on it right now. but hopefully figure out a permanent solution Quote Link to comment
fiveoneO Posted January 10 Report Share Posted January 10 I'm with Datzenmike on this one. The sender should ground to the tank and the tank should ground to the car. Drilling a hole in the sender is a bad idea. Make sure your tank is grounded properly to the car. You should be looking for 1 ohm or less of resistance for a proper ground. Quote Link to comment
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