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Old 01-28-2006, 04:33 PM
illegalFSJ illegalFSJ is offline
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Just noticed a new problem on the old J10. Driving home tonight, noticed the headlights "pulsing" as I drove - as in getting dimmer and then brighter. Pulse is pretty rapid; several times per second. Almost looks like one of those motorcycle headlights that has the same effect. At idle, lights are dim and blower motor is very slow. Rev 'er up and the blower motor comes on strong, and the headlights get brighter (but with the pulse).
I'm not running any aftermarket electrical accessories (I don't even have a radio) and have just installed a sweet Optima Red battery that I nabbed from a truck a friend was parting out (score!).
Battery cables are new, and connections are clean and tight.
I'm thinking it has to be something with the alternator or voltage regulator?
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"Well, what gears do you have? If you have 2.72s in there still, a blown big block with jesus himself working the gas pedal couldnt get the rear tires to slip." -Mavawreck

1977 J10, shortbed, 360, T18a 4-speed, D20, 32\" A/T tires, Warn hubs - Forest Service Green
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Old 01-28-2006, 04:37 PM
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Tigger4X Tigger4X is offline
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Your J is a '77 and most likely it is the alternator giving you the pulse. Take it down to your local parts house and have it checked to be sure before you go shelling out your hard earned dough.

Best of luck

~

WAIT WAIT WAIT ... I was too quick to shoot my mouth off ... check the tension on your alternator belt first.

~

[ January 28, 2006, 10:40 PM: Message edited by: Tigger4X ]
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Post #14 ~ http://www.ifsja.org/forums/vb/showt...=1#post1580206
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Old 01-28-2006, 05:55 PM
Crash Dummy Crash Dummy is offline
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Sometimes it's the voltage regulator..........
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Old 01-28-2006, 11:29 PM
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drlocke drlocke is offline
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That's a classic old problem usually caused by the voltage regulator. Pulsing lights and no charge a-tall at idle. My old Valiant used to do that and I'd replace the regulator and problem solved--an annual event. Never did figure out why that old car et up regulators so soon. Could be they were just cheaply made.
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Old 01-29-2006, 06:23 AM
illegalFSJ illegalFSJ is offline
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Thanks guys, I'll huck a new regulator at 'er and see what happens.
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"Well, what gears do you have? If you have 2.72s in there still, a blown big block with jesus himself working the gas pedal couldnt get the rear tires to slip." -Mavawreck

1977 J10, shortbed, 360, T18a 4-speed, D20, 32\" A/T tires, Warn hubs - Forest Service Green
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Old 01-29-2006, 07:01 AM
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Tigger4X Tigger4X is offline
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Quote:
Originally posted by drlocke:
That's a classic old problem usually caused by the voltage regulator. Pulsing lights and no charge a-tall at idle. My old Valiant used to do that and I'd replace the regulator and problem solved--an annual event. Never did figure out why that old car et up regulators so soon. Could be they were just cheaply made.
~

The regulator still external of the alternator on the '77 I thought they were an integral unit.

~
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Post #14 ~ http://www.ifsja.org/forums/vb/showt...=1#post1580206
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