idiot lights.....68 lemans - Pontiac GTO Forum
Pontiac GTO Pontiac GTO Forum

» Auto Insurance
Wheel & Tire Center

Go Back   Pontiac GTO Forum > The 1964-1974 Pontiac GTO > 1964-1974 GTO General Discussion
Register Home Forum Active Topics Photo Gallery Garage Search Today's Posts Mark Forums Read Auto EscrowInsurance

GtoForum.com is the premier Pontiac GTO Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 12-31-2012, 07:01 PM   #1 (permalink)
 
poncho power's Avatar
 
Join Date: Nov 2012
Posts: 77
My Photos: (0)
Garage
idiot lights.....68 lemans

I hate to keep bothering you guys with all the little problems I'm finding with this car, but I figure who better to ask, then the guys that have been through it?

Idiot lights.......
My oil pressure light works perfect, turn key on, light is on. start the engine, in a couple seconds light goes off....

Generator light....
turn key on, and no light..... when I crank over engine it comes on, but as soon as engine starts and I let off the key, the light goes off.... Isn't the light suppose to be on when the key is in the ON position ? Well, it is not.

Temp light.....
This light I cannot get to come on at anytime. I changed the light bulb, and still nothing... I unhooked the wire at the temp sender, and nothing..... So then I grounded the wire at the sender to a good ground, and still nothing.... I did that with the key on, still no temp light...

I'm really not sure what to try next.... any ideas would be great... thanks guys...
poncho power is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 12-31-2012, 11:18 PM   #2 (permalink)
Administrator
 
05GTO's Avatar
 
Join Date: Oct 2004
Location: Deliverance, GA
Posts: 4,771
My Photos: (473)
Place the positive lead of your volt meter on the battery positive post, connect the negative lead of the meter to the dark green t-stat wire (unpluged from the temp sensor), turn on the switch. You should read 12-13 volts. If you don't check the grounding for the keyswitch.

The idiot lights receive their positive voltage thru the pink wires, check the splice points behind the dash.
__________________
Randy


05GTO is online now   Reply With Quote
Old 12-31-2012, 11:26 PM   #3 (permalink)
 
poncho power's Avatar
 
Join Date: Nov 2012
Posts: 77
My Photos: (0)
Garage
Quote:
Originally Posted by 05GTO View Post
Place the positive lead of your volt meter on the battery positive post, connect the negative lead of the meter to the dark green t-stat wire (unpluged from the temp sensor), turn on the switch. You should read 12-13 volts. If you don't check the grounding for the keyswitch.

The idiot lights receive their positive voltage thru the pink wires, check the splice points behind the dash.
Thanks, I will give that a try tomorrow...

How about the Gen light, shouldn't that light be on in the ON position? Mine only comes on in the cranking position.
poncho power is offline   Reply With Quote
Old 01-01-2013, 10:57 AM   #4 (permalink)
 
poncho power's Avatar
 
Join Date: Nov 2012
Posts: 77
My Photos: (0)
Garage
Ok, so I checked the temp wire today, and it was just the opposite of what it's suppose to do. I lad 12 volts with the key OFF, but when I turned the ON, the voltage went down to .500V. I wonder if I have a ground problem? The guy before me had painted the firewall, inner fenders, etc.... I'm wondering if he cleaned contact surfaces under ground straps? I might have to do some more digging.
poncho power is offline   Reply With Quote
Old 01-01-2013, 11:19 AM   #5 (permalink)
Super Moderator
 
BearGFR's Avatar
 
Join Date: Aug 2008
Location: Springtown, TX
Posts: 4,467
My Photos: (12)
Garage
Check for blown fuses. On my 69 there's one in particular that supplies power to the gauges/indicator lights. Now, I know what you're thinking - "but the lights come on sometimes so it can't be a blown fuse". Yes it can. The way the alternator indicator light circuit works will feed power to the lights/gauges "in reverse" even if the fuse is blown (and it will also make your alternator light "act funny").

Bear
__________________
BearGFR
Garland, TEXAS
BearGFR is offline   Reply With Quote
Old 01-01-2013, 11:24 AM   #6 (permalink)
 
poncho power's Avatar
 
Join Date: Nov 2012
Posts: 77
My Photos: (0)
Garage
Quote:
Originally Posted by BearGFR View Post
Check for blown fuses. On my 69 there's one in particular that supplies power to the gauges/indicator lights. Now, I know what you're thinking - "but the lights come on sometimes so it can't be a blown fuse". Yes it can. The way the alternator indicator light circuit works will feed power to the lights/gauges "in reverse" even if the fuse is blown (and it will also make your alternator light "act funny").

Bear
But my oil pressure light works perfect, wouldn't that rule that out? And IT actually did check all the fuses before looking for anything else, so ???
poncho power is offline   Reply With Quote
Old 01-02-2013, 01:12 PM   #7 (permalink)
 
Join Date: Oct 2012
Location: NE PA
Posts: 15
My Photos: (0)
i bet your bulb is burnt out. you should not see voltage at your sending unit. think of the sending unit as a switch. it is open (off) when cold. it closes (on) when overheated. it completes the circuit for the light buulb by giving the negative potential. with your key in the on position, placing the the sending unit wire to the negative battery post or engine block the light should go on. if the bulb is good, you may want to ohm out from the sending unit to the bulb socket. the wire goes through the bulkhead connector. i wired plenty of these cars. this past weekend the 66 i just got had the temperature bulb plugged into the brake light indicator.
66 Gas Tires Oil is offline   Reply With Quote
Old 01-02-2013, 01:22 PM   #8 (permalink)
 
poncho power's Avatar
 
Join Date: Nov 2012
Posts: 77
My Photos: (0)
Garage
Well, I did replace bulb right away, and that wasn't it... should the temp light come on with just the key on? Not running, but just key ON? If so, how does the sender ground the circuit then when the engine is cold?
poncho power is offline   Reply With Quote
Old 01-02-2013, 01:58 PM   #9 (permalink)
 
Join Date: Oct 2012
Location: NE PA
Posts: 15
My Photos: (0)
the temp light comes on when you engine is overheating. it basically warns you to turn off your engine or you will do damage to it. it only gets a negative to the bulb at that time. oherwise the switch (sending unit) is off.

jim
66 Gas Tires Oil is offline   Reply With Quote
Old 01-02-2013, 02:24 PM   #10 (permalink)
 
Join Date: Oct 2012
Location: Texas
Posts: 555
My Photos: (7)
idiot lights

Like '66 tires, said-check that the bulbs are plugged into their proper holes behind the dash. That'll throw the whole ball of wax off in a New York minute. Also check dash grounds.
gjones is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

  Pontiac GTO Forum > The 1964-1974 Pontiac GTO > 1964-1974 GTO General Discussion


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
67 Tempest or Lemans Tail lights jday240 1964-1974 Tempest, LeMans & GTO Restoration Discussions 3 08-21-2012 04:58 PM
FS: 1967 Lemans Tail Lights & Bezels nedorama 1964-1974 GTO parts for sale (Price & Pictures Required) 2 10-11-2010 04:44 PM
71 lemans sport convertible ( No Brake lights ) projectszero 1964-1974 GTO General Discussion 9 08-20-2010 09:44 PM
71 Lemans cluster lights and fuel gauge OrbitOrange 1964-1974 Tempest, LeMans & GTO Technical Discussions 5 08-01-2010 09:25 PM
Idiot lights??? JerzeeGTO Service, Maintenance and Technical Discussion 3 10-24-2006 09:22 AM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -5. The time now is 10:57 PM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.3.2
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.