Many Gauge Questions (78 CJ7)... - JeepForum.com
 
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post #1 of 8 Old 10-21-2003, 02:05 PM Thread Starter
TrappG
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Many Gauge Questions (78 CJ7)...

Where do I start??? I'm basically looking for points of entry on getting my issues straightened out...

Speedo cluster: speedo works. H2O temp will go to extreme hot zone after about 2 minutes of running. I know it's not actually running hot because I'm not even out of the neighborhood yet and the cooling system isn't even pressurized by the time it's reading hot. (I have a fairly new radiator, new therm. and rad. cap) Temp. gauge sending unit??? Fuel gauge reads full all the time. I have a feeling this will require I drop the tank and get to the mechanics/electronics of that???

Amps: It sits on zero all the time. What is it supposed to read? Battery and alt are brand new. (not sure if gauge is stock or aftermarket)

Oil Pressure: Reads about 20+psi when cruising at 45 mph (or most speeds for that matter) When idling it's lower and under acceleration it's higher than 20+. Is 20psi under normal running conditions pretty normal for my 304 or should I see it higher? I feel like the gauge works but am just concerned with it's readings. (not sure if gauge is stock or aftermarket)

And last but not least, none of my dash lights work. All lights, brake lights, turn signals, whipers, heater fan, etc. work fine. Where do I start to troubleshoot this?

Thanks guys (and gals, of course)! This forum has been nothing but 100% informative since my introduction to this crazy "Jeep thing" only a couple of months ago.


'78 CJ7 - 304 - Hooker Headers/Sidepipes
TH400/QuadraTrac, B&M shifter (sold spring '04)

'04 Sahara - I6, 5spd bone-stock...

Last edited by TrappG; 10-21-2003 at 02:08 PM.
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post #2 of 8 Old 10-21-2003, 02:12 PM
andyp65
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where are you connecting your temp sending unit at on my dads 76 his Sender is at the front of the block and on my 81 its at the back of the block

1981 Blue Cj-7
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post #3 of 8 Old 10-21-2003, 02:16 PM
jddausch
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you need to check all of your gauges, wiring and grounds before anything. one bad ground can screw up a whole mess of stuff.

check this site: http://www.monsterslayer.com/jeep/Gauges.htm

it will walk you through everything. good luck

'91 YJ 4 banger
'94 YJ 4.0L
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post #4 of 8 Old 10-21-2003, 10:03 PM
kjc2260
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I had all those same problems with my '77 and I'll tell you what I did to fix it and hopefully it will help you. First, you're fuel and temp gauge work together, so one or both could be bad. I took the dash panel off so I had better access and removed the speedo, oil pr., and volt gauges. I then replaced both the fuel and temp gauges with new ones that I ordered from 4wd Hardware. (about 70.00 for the pair) Make sure you clean all the corrosion off the metal strap that connects the two. I then replaced the oil pr. and volt gauge with Auto Meter gauges that fit in the stock size holes, so no grinding is needed ( about 75.00 for the pair) Hopefully you have a Haynes or some kind of maintenance manual with wiring layout and used it to check all my wires for power that go to the different lights. That way you can find out which indicator lamps you need to replace. I replaced all mine since they only cost about 20.00. This in addition to checking the usual loose wires, grounds, ect. Now everything works like it should. If not, then I would worry about a bad float in the tank. That's a whole different can of worms to get into. Hope this helps.
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post #5 of 8 Old 10-22-2003, 01:48 AM
Sandman74
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Man, in all honesty I would ditch the stock gauges and go with some quality aftermarket gauges. Summitt racing sells AutoMeter gauge kits for about$220. Atleast you know you are dealing with something that works. I wish I knew how many stock gauges I sent back to 4wdHardware because of defect. Atleast that would give you a foundation to build off of.

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post #6 of 8 Old 10-22-2003, 12:14 PM
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mechanical aftermarket gauges are the way to go, especially for oil press and volts (which isn't really mechanical of course), which are in separate holes anyway. Ditch the Ammeter and go with volts, that's better anyway. Do the checks for fuel level and water temp to find out if gauge or sender is the culprit, then replace the appropriate parts or sort out the shorts/improper ground issues.

The dash lights do have their own fuse (at least in my 85) so that's something basic you'll want to check for that problem (if you haven't already). This is what i did:


1985 CJ7 MC2100,TFI, 2.5" BDS suspension, Full Cage, 31" Mud Tires, 1/2" MORE shackles, Aussie Locked AMC 20
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post #7 of 8 Old 10-22-2003, 08:00 PM
Jeep Daddy
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I like the diamond plate. Good answers to the questions. What brand of gauges are those? They look sweet. Another post was right on about the fuel and temp gauge working together. They actually have a strap together that is in fact a voltage regulator. If that part is bad, both gauges will be wrong.

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post #8 of 8 Old 10-24-2003, 06:57 AM
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Quote:
Originally Posted by Jeep Daddy
I like the diamond plate. Good answers to the questions. What brand of gauges are those? They look sweet. Another post was right on about the fuel and temp gauge working together. They actually have a strap together that is in fact a voltage regulator. If that part is bad, both gauges will be wrong.
Thanks... i was happy with how it turned out. The gauges are Autogage, made by Autometer, so the quality is high, but they're the "budget" model line... i think they were around $20 each. The don't look as cool as Autometers, but they kind of fit the look of the jeep.

1985 CJ7 MC2100,TFI, 2.5" BDS suspension, Full Cage, 31" Mud Tires, 1/2" MORE shackles, Aussie Locked AMC 20
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