83 CJ7 Electrical - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > CJ Jeep Forum > CJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 07-28-2019, 03:13 PM
Thread Starter
  #1
Jeeper
 
MadRussian's Avatar
 
Join Date: Oct 2014
Location: Raleigh NC
Posts: 250
83 CJ7 Electrical

Got this one 2 months ago. Came with small block Chevy and looks like mostly frame off restoration.


The harness looks like a painless harness. Each wire is labeled with its purpose, which is nice.


The original speedometer gauge "worked" to an extent. The speedometer (mechanical off the transmission) would max out at 55mph and bounce between 50-55mph. Also the temp gauge and fuel gauge were crapped out. I wanted to add a tachometer so I bought a CJ Gauge from Speedhut and get everything into one.


After a few weeks I am now a bit frustrated. Here are general observations on what is happening:
1. At start up gauges work just fine, they cycle through the full range, then settle to their operational position.
2. Radio works just fine as well, which has its own separate 12v keyed signal.

3. About 3-5 mins into driving around, voltage gauge starts bouncing between 12-15 volts, occasionally going below 12v. The voltage settles when I push clutch in.
4. The gauges (and radio) shut off independently and seemingly randomly.


Now I did run a sole 12v wire directly from the battery to the 12V key wire input on the gauges. No real change. Voltage going ape$hit, gauges shut off randomly.


I think this is a ground issue. Any other ideas? Possible alternator issue?

MadRussian is offline   Quote
Old 07-28-2019, 09:11 PM   #2
Jeeper
 
tylermats's Avatar
 
Join Date: Jan 2013
Location: Location Location
Posts: 531
Quote:
Originally Posted by MadRussian View Post
Got this one 2 months ago. Came with small block Chevy and looks like mostly frame off restoration.


The harness looks like a painless harness. Each wire is labeled with its purpose, which is nice.


The original speedometer gauge "worked" to an extent. The speedometer (mechanical off the transmission) would max out at 55mph and bounce between 50-55mph. Also the temp gauge and fuel gauge were crapped out. I wanted to add a tachometer so I bought a CJ Gauge from Speedhut and get everything into one.


After a few weeks I am now a bit frustrated. Here are general observations on what is happening:
1. At start up gauges work just fine, they cycle through the full range, then settle to their operational position.
2. Radio works just fine as well, which has its own separate 12v keyed signal.

3. About 3-5 mins into driving around, voltage gauge starts bouncing between 12-15 volts, occasionally going below 12v. The voltage settles when I push clutch in.
4. The gauges (and radio) shut off independently and seemingly randomly.


Now I did run a sole 12v wire directly from the battery to the 12V key wire input on the gauges. No real change. Voltage going ape$hit, gauges shut off randomly.


I think this is a ground issue. Any other ideas? Possible alternator issue?
Doesnt sound like an alternator issue to me. Yes I would check grounds first, I always check grounds first.

tylermats is offline   Quote
Old 07-31-2019, 09:04 AM   #3
Jeeper
 
Tahoe's Avatar
 
Join Date: May 2010
Location: Houston
Posts: 162
Grounds !!! Also check the starter solenoid and the contacts there. My ‘81 CJ 7 would show good voltage etc. Then for no reason it was showing less and less, hovering around 13. Traced it back to a loose nut and after cleaning up the contacts and tightening the nut evrything was back to normal.
__________________
1964 CJ3B
1978 CJ5
1981 CJ7
1992 YJ
2002 TJ
Tahoe is offline   Quote
Sponsored Links
Advertisement
 
Old 08-05-2019, 09:35 PM
Thread Starter
  #4
Jeeper
 
MadRussian's Avatar
 
Join Date: Oct 2014
Location: Raleigh NC
Posts: 250
Yeah, it was mainly grounds. The harness was grounded to the body. The painted body. The battery was only grounded to the engine. Nothing else. With a 2" body lift, this would explain randomly losing voltage.


Grounded the battery to the body and cleaned up the harness grounds to the body Fixed everything except the turn signals, which maybe something else.
MadRussian is offline   Quote
Old 08-08-2019, 11:37 AM   #5
Jeeper
 
Tahoe's Avatar
 
Join Date: May 2010
Location: Houston
Posts: 162
Good to hear, thanks for the update.
__________________
1964 CJ3B
1978 CJ5
1981 CJ7
1992 YJ
2002 TJ
Tahoe is offline   Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off






All times are GMT -5. The time now is 05:44 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.1
User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, Gladiator, Mopar and Grand Cherokee are copyrighted and trademarked to FCA US LLC.
Wranglerforum.com is not in any way associated with FCA US LLC.