TEMP GAUGE, FUEL GAUGE, AND SPEEDO HELP PlEASE - JeepForum.com
 
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post #1 of 9 Old 11-01-2009, 12:55 PM Thread Starter
cgi2099
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1984 CJ7 
 
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TEMP GAUGE, FUEL GAUGE, AND SPEEDO HELP PlEASE

My speedo, fuel, and temp gauges all do not work, was wondering if anyone could tell me where all the grounds are for these gauges and what the most common problem would be for these gauges not to work. I have all the tools to ohm the gauges and sending unit if need be, but im hoping the grounds are what are causing all my troubles i just dont know where the grounds are. I can tell you this there are 4 black wires by the silonoid not hooked up to anything, 3 with rubber plugs that looks to go on a threaded screw or terminal and 1 circular one that looks like it would be screwed into the tube some where.

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post #2 of 9 Old 11-01-2009, 01:02 PM
GreenCJDan
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1975 CJ5 
 
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The gauges all ground to the metal case which holds the speedo cluster. the case grounds to the dash, the dash to the tub, tub to the frame, etc. My ground was bad because the new paint on the dash stopped the current from passing. check the resistance between a bare metal spot on the dash and the metal ring of the speedo. there should be little to no resistance. If that is the case, the grounding should be ok. Search for threads on this subject, there are thousands, and some good diagrams to follow for checking voltage at the various posts.
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post #3 of 9 Old 11-01-2009, 01:07 PM
-jeep-jeep-
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the same gauges dont work on my cj7, the only one i got that works is the volt gauge

Jeep # 1 - 1947 CJ2a - Restoration in progress...very slow progress
Jeep # 2 -1983 CJ7 - 31x10.5R15 Pro Comp Extreme mt's - 4.0 HO head - MC2100
Jeep # 3 - 1990 Cherokee - 4.0, AW4, dana 30 HP, dana 35 -31x10.5 R15 mud terrains, 2" PNP lift.....Gone to the crusher
Jeep # 4 - 1999 wj stock and still pretty
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post #4 of 9 Old 11-01-2009, 01:25 PM Thread Starter
cgi2099
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Ok thank you this helps a bunch, hopefully there is rust there so it will be an easy fix.
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post #5 of 9 Old 11-01-2009, 01:39 PM
Mike Romain
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The speedo works on a cable and the other two gauges get power through a mechanical regulator built into the fuel gauge. When this regulator pops, no power to either gauge or if it's points stick, too much power which lets the magic smoke out and the stop working.

Look up John Strenk's posts for links to diagnostics:
Basic Troubleshooting for CJ gauges
CJ Gauge Specification Chart
CJ Speedometer Gauge Quick Test
The new Gauge Page

Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
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post #6 of 9 Old 11-02-2009, 04:42 AM
John Strenk
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Quote:
Originally Posted by -jeep-jeep- View Post
the same gauges dont work on my cj7, the only one i got that works is the volt gauge
And I wouldn't necessarily trust that one either.

Thanks Mike for posting the links.
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post #7 of 9 Old 11-02-2009, 05:09 AM
jeepduo
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1978 CJ7 
 
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I ran a seperate ground wire all around my jeep, just to eliminate
bad body grounds. I take it your jeep is all together. It will be a pain to
do, but it will save you alot of headaches. I did mine as I was putting it together.

1978 CJ7, Driving, but never finished
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post #8 of 9 Old 11-03-2009, 01:23 PM Thread Starter
cgi2099
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Thank you very much i think i have found the problem, im gettin power to the fuel gauge but nothing out, so i guess that regulator is bad.
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post #9 of 9 Old 11-03-2009, 05:49 PM
-jeep-jeep-
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Quote:
Originally Posted by John Strenk View Post
And I wouldn't necessarily trust that one either.

Thanks Mike for posting the links.
your probably right about that, i dont trust my spedometer eitehr ti says im always going 20 ,

atleast i know why my temp gauge dosnt work but the rest i dont have a clue

Jeep # 1 - 1947 CJ2a - Restoration in progress...very slow progress
Jeep # 2 -1983 CJ7 - 31x10.5R15 Pro Comp Extreme mt's - 4.0 HO head - MC2100
Jeep # 3 - 1990 Cherokee - 4.0, AW4, dana 30 HP, dana 35 -31x10.5 R15 mud terrains, 2" PNP lift.....Gone to the crusher
Jeep # 4 - 1999 wj stock and still pretty
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