Bad reading on gauge
Thread Starter
Instructor
Joined: Jul 2006
Posts: 137
Likes: 1
From: Litchfield Park AZ
Bad reading on gauge
I just installed an Auto Meter fuel pressure gauge. Got all the wiring done and turned the key.
Gauge went first all the way to max (it was at zero), back to zero then back to max and sits there.
When I shut the motor off it stays at max (it's an electrical gauge). When I turn the key back on, it cycles from max, to zero, back to max and stays there. Does not move at all.
Red wire is to a 12v switch source. Black wire to known good ground.
Anyone have any thoughts?
Thanks
Gauge went first all the way to max (it was at zero), back to zero then back to max and sits there.
When I shut the motor off it stays at max (it's an electrical gauge). When I turn the key back on, it cycles from max, to zero, back to max and stays there. Does not move at all.
Red wire is to a 12v switch source. Black wire to known good ground.
Anyone have any thoughts?
Thanks
Tech Contributor
Joined: Dec 2006
Posts: 10,962
Likes: 29
From: Van Buren Arkansas
Wounded Warrior Escort '11
I've never installed one before but suspect there has to be a 3rd wire of some sort to go to the pressure sensor that you must have installed at the same time. Are you sure you connected the correct wires per the manufacturer's instructions? No offense meant its just sometimes the simplest of things can't be the problem.
Thread Starter
Instructor
Joined: Jul 2006
Posts: 137
Likes: 1
From: Litchfield Park AZ
Actually, there is a plug that goes to a sending uint on the fuel rail and a plug that goes to the back of the gauge.
Other than lights, there are only 2 wires that get wired directly to the car...12v switch source and ground. And those 2 come out of the back of the plug going into the gauge.
So, yes, it's all wired up correctly.
Other than lights, there are only 2 wires that get wired directly to the car...12v switch source and ground. And those 2 come out of the back of the plug going into the gauge.
So, yes, it's all wired up correctly.
Tech Contributor
Joined: Jan 2007
Posts: 19,470
Likes: 1,170
From: Dyer, IN
I just installed an Auto Meter fuel pressure gauge. Got all the wiring done and turned the key.
Gauge went first all the way to max (it was at zero), back to zero then back to max and sits there.
When I shut the motor off it stays at max (it's an electrical gauge). When I turn the key back on, it cycles from max, to zero, back to max and stays there. Does not move at all.
Red wire is to a 12v switch source. Black wire to known good ground.
Anyone have any thoughts?
Thanks
Gauge went first all the way to max (it was at zero), back to zero then back to max and sits there.
When I shut the motor off it stays at max (it's an electrical gauge). When I turn the key back on, it cycles from max, to zero, back to max and stays there. Does not move at all.
Red wire is to a 12v switch source. Black wire to known good ground.
Anyone have any thoughts?
Thanks
Thread Starter
Instructor
Joined: Jul 2006
Posts: 137
Likes: 1
From: Litchfield Park AZ
There is no ground at the sending unit. The only ground comes off the back of the plug on the gauge itself.
Are you saying that one could be bad?
If so I really don't think so, it's being shared by another gauge that is working just fine...but I will double check tomorrow.
Are you saying that one could be bad?
If so I really don't think so, it's being shared by another gauge that is working just fine...but I will double check tomorrow.
Tech Contributor
Joined: May 2008
Posts: 2,843
Likes: 16
From: Howell Michigan
St. Jude Donor '09-'10-'11
I am not familiar with your exact gauge, but most electronic gauges of this type will have ether three wires at the gauge, 12V, Ground, and one to the sending unit, or the second arrangement is 12V at the gauge, and a single negative connection that does NOT go to ground, but to the sending unit. The sending unit in both arrangements varies in resistance depending on the pressure. The sending unit has to be grounded and normally gets its ground from the threads and what it screws into. In some cases the sending unit will have two terminals, one to the negative on the gauge and the other to a ground.
Thread Starter
Instructor
Joined: Jul 2006
Posts: 137
Likes: 1
From: Litchfield Park AZ
I downloaded the directions straight frorm Auto Meter's site.
http://www.autometer.com/cat_gaugede...gid=2526&sid=3
The sender has a 3 wire plug going to the back of the gauge. The gauge has 2 wires coming from that plug (power and ground). Mine did not have the 3rd wire in the directions for LED lighting. I followed these directions as printed.
The light bulb wiring is a moot point, it's separate from the rest.
http://www.autometer.com/cat_gaugede...gid=2526&sid=3
The sender has a 3 wire plug going to the back of the gauge. The gauge has 2 wires coming from that plug (power and ground). Mine did not have the 3rd wire in the directions for LED lighting. I followed these directions as printed.
The light bulb wiring is a moot point, it's separate from the rest.
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Tech Contributor
Joined: Jan 2007
Posts: 19,470
Likes: 1,170
From: Dyer, IN
I downloaded the directions straight frorm Auto Meter's site.
http://www.autometer.com/cat_gaugede...gid=2526&sid=3
The sender has a 3 wire plug going to the back of the gauge. The gauge has 2 wires coming from that plug (power and ground). Mine did not have the 3rd wire in the directions for LED lighting. I followed these directions as printed.
The light bulb wiring is a moot point, it's separate from the rest.
http://www.autometer.com/cat_gaugede...gid=2526&sid=3
The sender has a 3 wire plug going to the back of the gauge. The gauge has 2 wires coming from that plug (power and ground). Mine did not have the 3rd wire in the directions for LED lighting. I followed these directions as printed.
The light bulb wiring is a moot point, it's separate from the rest.