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Author Topic:   dimming lights
fly75
Gearhead

Posts: 140
From: eastpointe,mi,usa
Registered: Jul 99

posted 01-14-2001 10:05 AM     Click Here to See the Profile for fly75   Click Here to Email fly75     Edit/Delete Message   Reply w/Quote

my lights on my 68 gt/cs keep slightly dimming when they are on,could this be a bad ground or does anyone think i might need a one-wire alternator?

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68 california special

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Dave Gibson
Moderator

Posts: 5246
From: Pensacola, Florida, USA M&M#166 MCA#47921
Registered: Aug 99

posted 01-14-2001 12:16 PM     Click Here to See the Profile for Dave Gibson   Click Here to Email Dave Gibson     Edit/Delete Message   Reply w/Quote
Fly,
Does this dimming occur when you let off the gas or does that happen all by itself?? Just curious. We had the same problem with the '65 and replaced the alternator. No more dimming problem. A little more back round on your problem would help, please.

Dave & Terri

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66 Bench Coupe (Anna Belle)
65 "A" Code w/4 Speed (Poni)
66 "C" Code Coupe (Sally)
MCA#47921
M&M #166

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fly75
Gearhead

Posts: 140
From: eastpointe,mi,usa
Registered: Jul 99

posted 01-14-2001 09:04 PM     Click Here to See the Profile for fly75   Click Here to Email fly75     Edit/Delete Message   Reply w/Quote
when the lights are on and youre in idle mood they flicker but it seems like when you drive they seem not to flicker,i had the alt.checked out before and they said it was a good one

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68 california special

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Dave Gibson
Moderator

Posts: 5246
From: Pensacola, Florida, USA M&M#166 MCA#47921
Registered: Aug 99

posted 01-14-2001 10:24 PM     Click Here to See the Profile for Dave Gibson   Click Here to Email Dave Gibson     Edit/Delete Message   Reply w/Quote
Fly,
You may want to also have your voltage regulator checked.

Dave & Terri

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66 Bench Coupe (Anna Belle)
65 "A" Code w/4 Speed (Poni)
66 "C" Code Coupe (Sally)
MCA#47921
M&M #166

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sigtauenus
Gearhead

Posts: 1413
From: Beaufort, SC
Registered: Jun 2000

posted 01-15-2001 01:13 PM     Click Here to See the Profile for sigtauenus   Click Here to Email sigtauenus     Edit/Delete Message   Reply w/Quote
I think it may depend on what amp rated alternator you have. If you have a stock no-option alt, which is like 38 amps or something, at idle its only putting out like 15 amps, maybe less, and only pulls that 38 amps up at higher rpm, or once you start moving. When you have the alternator tested, it works fine, but its just not putting out enough output for your car at idle. If you upgrade to a alternator that puts out more amps, it'll solve that flickering at idle, but its really not necessary unless it bothers you. My opinion only.

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mellowyellow
Gearhead

Posts: 3206
From: So. Fl.
Registered: Aug 2000

posted 01-15-2001 04:00 PM     Click Here to See the Profile for mellowyellow     Edit/Delete Message   Reply w/Quote
My ol' mellowyellos 68 cvt had a flickering problem when I first got it on the road. A new regulator solved the problem

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fly75
Gearhead

Posts: 140
From: eastpointe,mi,usa
Registered: Jul 99

posted 01-15-2001 10:21 PM     Click Here to See the Profile for fly75   Click Here to Email fly75     Edit/Delete Message   Reply w/Quote
hey thanks everyone,i will try getting a new voltage reg. my alt.is putting out 70 amps they tell me so i think i am ok there. i hope to put in the new one in this weekend so i will keep you informed, thanks again!

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68 california special

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67Stangboy
Journeyman

Posts: 67
From: Lafayette, Indiana
Registered: Jul 99

posted 01-20-2001 08:57 AM     Click Here to See the Profile for 67Stangboy   Click Here to Email 67Stangboy     Edit/Delete Message   Reply w/Quote
What if you alternator isnt putting out anything?? I had it checked and they said nothing was happening. They suggested checking the "exciter wire". The battery died on me yesterday so I got a new one and it has started up fine every time. The only problem is the lights are really yellow, but they were that way before I put the new battery in. I didnt have any problem before I put it up in September for the winter. Just got it out yesterday because I really missed driving it and the roads were clean. Could it be my voltage regulator?? Thanks for all the help.

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Kit
67 Coupe
I-6, 3sp
289 on the way

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Dave Gibson
Moderator

Posts: 5246
From: Pensacola, Florida, USA M&M#166 MCA#47921
Registered: Aug 99

posted 01-20-2001 09:21 AM     Click Here to See the Profile for Dave Gibson   Click Here to Email Dave Gibson     Edit/Delete Message   Reply w/Quote
Kit,
I'm not sure what the "exciter wire" is that you are refering to. I would start by having your alternator re-checked now that you have a new battery. I would also check all the connections and make sure the terminals are clean so that the wires are making good connections. Start with the simple things and work your way up. If nothings turns up from there, then I would look towards replacing the Voltage Regulator and the Alternator. A general rule of thumb that I use is, to replace both the voltage regulator and alternator at the same time. It's always worked for me. Hope this helps, Kit.

Dave & Terri

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66 Bench Coupe (Anna Belle)
65 "A" Code w/4 Speed (Poni)
66 "C" Code Coupe (Sally)
MCA#47921
M&M #166

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67Stangboy
Journeyman

Posts: 67
From: Lafayette, Indiana
Registered: Jul 99

posted 01-20-2001 10:57 AM     Click Here to See the Profile for 67Stangboy   Click Here to Email 67Stangboy     Edit/Delete Message   Reply w/Quote
I did have my alternator checked after I installed the new battery. The guy said the "exciter wire" goes from the ignition to the alternator. He said it has to have something "excite" it before it will charge the battery. I have never heard of an exciter wire before either. I ll check all my connections and clean them up. Is there a possiblity that it could be the ignition switch or something to do with that?? Thanks again for the help guys and gals.

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Kit
67 Coupe
I-6, 3sp
289 on the way

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kid vishus
Gearhead

Posts: 1802
From: between the end of the road, and the middleof no-where
Registered: Oct 2000

posted 01-20-2001 11:06 AM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
The headlights should be grounded to the frame somewhere. If that ground is bad, the lights will be really yellow. I know, I chased the same problem on my 80 bronco.. ..I found where the lights grounded on the inner fender panels, took them apart, cleaned them up, and PRESTO, bright headlights again. I had done the whole, battery, voltage regulater,alternater thing too before that, I even went so far as to buy new headlights. Trace the wires from the headlights and check the grounds, you might be surprised. Plus, it's easy.

[This message has been edited by kid vishus (edited 01-20-2001).]

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66351stang
Gearhead

Posts: 622
From: sayville,newyork
Registered: Jul 2000

posted 01-20-2001 07:18 PM     Click Here to See the Profile for 66351stang   Click Here to Email 66351stang     Edit/Delete Message   Reply w/Quote
jump the regulator to full field and if the alt. is good should go to 16+,or dissconnect the battery when the car is running if alt. is good car will stay running if not car will stall.

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ponycar66,have you flown in a ford latley???????
66-COUPE W/351SVO
glad i had a v-8 !!!!!!
84.5 gt350-61 falcon 302
have a great day!!!!!!!!

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TomP
Moderator

Posts: 3423
From: Delta BC Canada
Registered: Dec 99

posted 01-20-2001 09:38 PM     Click Here to See the Profile for TomP   Click Here to Email TomP     Edit/Delete Message   Reply w/Quote
"it has to have something "excite" it before it will charge "

Yeah don't we all

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67Stangboy
Journeyman

Posts: 67
From: Lafayette, Indiana
Registered: Jul 99

posted 01-22-2001 05:21 PM     Click Here to See the Profile for 67Stangboy   Click Here to Email 67Stangboy     Edit/Delete Message   Reply w/Quote
Does anyone have a picture of what the wiring on the back of the alternator looks like? I installed a new one and hooked it up just like the old one was and it still isnt charging. There are four studs on the alternator(ground, battery, FLO, and STA), yet I only have 3 wires to hookup. The wiring schematic I have doesnt make sense. Thanks for any help.

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Kit
67 Coupe
I-6, 3sp
289 on the way

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