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  #1  
Old 09-08-2008, 07:08 PM
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Bob M Bob M is offline
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Question Genartor Woo'S !!!

We took a night trip last weekend and when I used my high beams my gen. light would come on very dim. Never ran the battery down but I would like any suggestion out there of things to do to correct this problem.
I have driven about 3200 miles this summer in the day time with no problems
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  #2  
Old 09-08-2008, 08:07 PM
bcomo bcomo is offline
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I have AC and 35 Amp Gen and that happens to me too. When the big load is put on the gen to come up with the charge, it just barely can do it.
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  #3  
Old 09-08-2008, 09:52 PM
birdbrain birdbrain is offline
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Default ground problem

I had this problem once as well, cleaned the ground strap and it went away. I used to see the generator light extra dim with heater , radio and lights on.
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  #4  
Old 09-08-2008, 10:18 PM
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You might want to take a look at the brushes in the generator.
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  #5  
Old 09-09-2008, 05:53 PM
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to get some more precise information you might install either an ammeter or voltage meter. Ammeters are harder to find but you can get a voltmeter anywhere (the Sunpro line in Autozone for example).

Grounds are always suspect in old cars due to rust, paint and so on...cleaning up both the engine and chasis ground is a good idea.

It never hurts to clean the brush holders and check the brushes. But your generator light is not on so I am not sure they are the immediate problem. One of my brushes was stuck in the holder due to dirt and my light kept going off and on. I cleaned it all up and that was the end of the problem.

John
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Old 09-09-2008, 09:24 PM
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Well I took the gen off and cleand it good put new brushes in it which the old ones look good but what the heck. I will try it this weekend . I tried to information about the PowerGen that is listed in our Tech section but have not heard back from them yet,
Will let youal know hao it works out next week
Thanks for all your imputs.
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  #7  
Old 09-09-2008, 09:27 PM
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I had the same issue when stopped at a light and the car idled low. Never had a battery issue, just assumed that the light was flawed. I did as John had mentioned and connected a voltage meter, never dipped beneath 12.
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  #8  
Old 02-03-2009, 07:32 PM
Richard D. Hord Richard D. Hord is offline
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Default Generator light on

I had generator rebuilt, changed out voltage regulator and cleaned all wires that went to both. I have purchase several 1960 Thunderbird books. I have one book that shows #18 yellow-black band wire going to ARM on voltage regulator another book shows same wire going to BAT terminal on voltage regulator. My Thunderbird still has factory wire end terminals on wires at voltage regulator. I can remove cover on voltage regulator and touch BAT contact and light will go out and stay out until I shut her off. But have the same problem after car is restarted. I have took these wire off ohm them out from regulator to generator and put them back where they were. Anyone have any ideal what wires goes where and or what else may be wrong?
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  #9  
Old 02-03-2009, 10:14 PM
bcomo bcomo is offline
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Richard:

I'll get you some info on the wires from my 60 tomorrow morning.

Meanwhile, here is a post that I wrote back in 2007.

Here is how the generator light works:

The generator light has two leads. One lead goes to the "hot" side of the ignition switch, where it get +12V. The other lead goes to the Armature (ARM) terminal at the regulator (smaller of the two yellow wires).

When the ignition key is turned on, but not started, the bulb gets power from the ignition switch, and is receiving a partial ground at the ARM terminal on the regulator.

Summary: The bulb goes on because it gets +12V from the ignition switch, and it gets partial ground (-) from the ARM terminal at the regulator. (+ to - = Bulb lights up)

When the engine is started, the ARM terminal receives +12V from the generator. Now the bulb sees +12V from the Ignition switch, and +12V from the ARM terminal at the regulator. (+ to + = Bulb goes off)

The bulb is in a constant state of "Tug-O-War" between the Ignition Switch +12V and the ARM terminal +12V. If the Generator puts out less than +12V, because of low RPM or loose belt, then the bulb will glow because there is less voltage on the ARM terminal and partially grounds the bulb again. (example: +12V at Ignition Switch to +11V at ARM Terminal = Bulb lights up).

So, at low engine RPM, in drive, at stop lights, the Generator Voltage output will normally fall below Battery Voltage at the Ignition Switch -- and the bulb goes on -- which is normal.

A light that stays on constantly means low generator voltage output directly from the generator.

Hope this helps.
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  #10  
Old 02-04-2009, 12:57 AM
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The gen light in my 60 has glowed dim (@ idle) since day one. Not all the time. Like everything else with that car it's intermittent. I know allot of people convert to internally regulated alternators. I've never had a problem with the generator. We've prob put 4 or 5 on that car in 48+ years (& pushing 300K miles). The only accesory that draws excessive power is the conv top mechanism. Since using that is pretty much like tea time in England (everything else stops) it's not a concern. If I had AC and elec fan and a thumper stereo, yeah, I would convert it. And who knows maybe someday we'll have all those things. Not likely very soon though.

I believe you can adjust the voltage regulator. Check the service manual.

JB
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