![]() |
Register or Log In To remove these advertisements. |
|
|
![]() |
|
Thread Tools | Display Modes |
![]() |
#1 |
Like a Rock!
Join Date: May 2002
Location: USA
Posts: 1,092
|
Generator light in dash stays on
In a plain 69 cluster, what would cause the generator light to stay on?. I put a tester on the battery and got 12.5 volts. I did the key off drain test with a tester and have had no problems. Any ideas?
![]()
__________________
69 LWB Runs great - work in progress Mess with me and you mess with the whole trailer park! ![]() |
![]() |
![]() |
![]() |
#2 |
Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
|
Stays on with key off or when running?
__________________
56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
![]() |
![]() |
![]() |
#3 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
|
was that 12.5 with the engine running??
|
![]() |
![]() |
![]() |
#4 |
Like a Rock!
Join Date: May 2002
Location: USA
Posts: 1,092
|
jhow66- stays on when driving
Longhorn man- that was with the engine off
__________________
69 LWB Runs great - work in progress Mess with me and you mess with the whole trailer park! ![]() |
![]() |
![]() |
![]() |
#5 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
|
what does the read with the engine on? The light will always be on with the ignition switch on and the engine off.
If it is on when the engine is running, it is supposed to mean you aren't charging. |
![]() |
![]() |
![]() |
#6 |
Like a Rock!
Join Date: May 2002
Location: USA
Posts: 1,092
|
I'll have to test it with the engine on to see what it reads voltage wise. When I'm driving down the road it stays on all the time.
__________________
69 LWB Runs great - work in progress Mess with me and you mess with the whole trailer park! ![]() |
![]() |
![]() |
![]() |
#7 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
|
You may not be charging.
On my old '70 longhorn, the light stayed on, and for no reason. Since I had installed after market guages under the dash (I don't trust 35 year old dummy lights) I just ripped the bulb out and called it good. (after verifying it was in fact charging) |
![]() |
![]() |
![]() |
#8 |
Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
|
This might help:
__________________
56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
![]() |
![]() |
![]() |
#9 |
Like a Rock!
Join Date: May 2002
Location: USA
Posts: 1,092
|
Thanks for the pic. How do I test my alternator to see if it's bad???
__________________
69 LWB Runs great - work in progress Mess with me and you mess with the whole trailer park! ![]() |
![]() |
![]() |
![]() |
#10 | |
Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
|
Quote:
__________________
56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
|
![]() |
![]() |
![]() |
#11 |
love my truck
Join Date: May 2001
Location: aylmer QC
Posts: 648
|
do this test. undo your - battery post, then with a test light toutch the - post and with the other end of test light toutch the unhooked batt cable. If the light on tester lights up uou got a short somewhere
While the light is lit up, unplug the voltage regulator. If light goes out then thats your probleme. |
![]() |
![]() |
![]() |
#12 |
Like a Rock!
Join Date: May 2002
Location: USA
Posts: 1,092
|
I did the test light trick to check for a drain and it didn't light up. Can I use a multimeter on the alternator to check to see if it's bad?. If so, how?
__________________
69 LWB Runs great - work in progress Mess with me and you mess with the whole trailer park! ![]() |
![]() |
![]() |
![]() |
#13 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
|
That test light deal only helps to locate a drain, not a faulty charging system.
Fire up the truck, and just place the leads on the battery. If it is less than 13, then you need to do more troubleshooting. Placing the lead on the large red wire on the back of the alt will give you the same reading as on the battery, but the battery is easier to get to when the engine is running. |
![]() |
![]() |
![]() |
#14 |
Like a Rock!
Join Date: May 2002
Location: USA
Posts: 1,092
|
Well, I went to drive the truck today and it wouldn't start up
![]() ![]()
__________________
69 LWB Runs great - work in progress Mess with me and you mess with the whole trailer park! ![]() |
![]() |
![]() |
![]() |
#15 |
Registered User
Join Date: Jun 2004
Location: Beeville, Texas
Posts: 1,943
|
It's only dangerous if you let the pos. cable touch a ground when you do that with the engine running. I've done it before to check the alternator on my truck and I'm still alive.
![]()
__________________
RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck |
![]() |
![]() |
![]() |
#16 |
Like a Rock!
Join Date: May 2002
Location: USA
Posts: 1,092
|
which cable am I supposed to remove when it's running?
__________________
69 LWB Runs great - work in progress Mess with me and you mess with the whole trailer park! ![]() |
![]() |
![]() |
![]() |
#17 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
|
The cable test will only tell 1/2 truths. If your alt is only putting out one amp, your engine will still run at an idle.
You can remove either cable, but the neg cable is safer to remove. |
![]() |
![]() |
![]() |
#18 |
I'm watching you!
Join Date: Feb 2005
Location: Levittown, PA
Posts: 1,822
|
:andy:
![]()
__________________
2012 Chevrolet Silverado 1500 Z71 4WD 1993 Chevrolet C-1500 W/T - Blue - 4.3L V-6, 4 speed auto - Dad's (RIP) 1992 Chevrolet S10 - LS swap project 1968 Chevrolet C-10 longbed fleetside - sold ![]() |
![]() |
![]() |
![]() |
#19 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
|
LOL, my computer was messin up...I had thought the board went down again.
![]() |
![]() |
![]() |
![]() |
#20 |
Registered User
Join Date: May 2005
Location: Texarkana, AR 71854
Posts: 397
|
Mine stayed on when my Coil was tightened down good enough..
__________________
2006 Titan SE Crew Cab Daily Driver 2005 Mazda Tribute (Wifes car) 1969 C10 SWB 350/3 Fleet "Max" 1969 Chevelle 2 door 350/3 |
![]() |
![]() |
![]() |
Bookmarks |
Thread Tools | |
Display Modes | |
|
|