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Unread 04-13-2013, 11:32 PM   #1
bdsmitch
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1983 CJ7 
 
Join Date: Feb 2012
Posts: 38
fuel guage

i put a new fuel and temp gauge in my 83 cj and everytime i put the ignition wire on it blows my fuse. i checked the wiring again and it is all correct. so i dont know why it is blowing.

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Unread 04-14-2013, 12:41 AM   #2
upleo
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me too same problem yesterday hoping for some advice. The wiring is correct
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Unread 04-14-2013, 08:43 AM   #3
Centerfire
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1986 CJ7 
 
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Perhaps check the internal resistance on both units?

http://home.sprynet.com/~dale02/specs.htm

and triple check the wiring?

http://home.sprynet.com/~dale02/gagetemp.htm
http://home.sprynet.com/~dale02/gagefuel.htm
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Unread 04-14-2013, 12:22 PM   #4
bdsmitch
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ok i am making progress i took my speedo back apart i think my fuel gauge was grounding out on my speedo causing my fuse to blow got it back on now and now have power to both my sending units. now to continue from there.

Can you run a single ground right to the fuel sending unit or do you split the ground wire and run a lead to a dedicated ground
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Unread 04-14-2013, 12:35 PM   #5
jimdubose
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the sending unit should ground to the frame, it should have come equipped with a black wire, all you need is a clean spot a screw and a hole (almost like sex, isn't it?)
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Unread 04-14-2013, 12:58 PM   #6
bdsmitch
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yes it is thats nice so i can cut off the black wire and screw it into the frame.
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Unread 04-14-2013, 01:09 PM   #7
jimdubose
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there should already be a hole somewhere on the inside of the driver's side frame where the old one grounded, close to the tank. shouldn't have to cut the black ground wire. On mine the hole in the frame is closer to the front of the tank, almost parallel, maybe a few inches forward
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Unread 04-14-2013, 01:17 PM   #8
jimdubose
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this is from this write up, it can answer more for you:

http://home.roadrunner.com/~john.str...for_cj_gau.htm
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Unread 04-14-2013, 06:37 PM   #9
bdsmitch
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that helps i got everything wired up correctly and i have my volt and temp gauge working. but my fuel and oil wont work. my fuel gauge reads right except for i to g and a to g so i ran a ground to the speedo and no change it is at 25 ohms. when i ground out the plug on the sending unit it doesnt move, so i think it is the gauge but it is brand new.
the oil gauge has power but the sender does not blink is it suspost to but if i take the plug off there is a dull light on the ground and sender.

any advice is greatly appreciated
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Unread 04-14-2013, 08:41 PM   #10
bdsmitch
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going over it again my sender to ground is 26 and i to ground is good and so is a to ground then the weird thing is my both my s to i and s to a are -18 at first i thought they were good but they are on the negitive side not sure what that means. this fuel gauge is driving me mad then i tried the temp again and from s to a it was at 3 ohms not sure where to go from here
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