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Old September 30th, 2016, 08:56 PM
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jimjaz jimjaz is offline
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Join Date: Jan 2013
Location: Tempe AZ
Truck: 1963 K-1000 Sub, 1963 C-1000 Sub, 1965 C-1000 Sub
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Default Re: Who needs strobe lights? AKA Headlights flickering on high-beam

Sounds like a short in the wiring on the high beam wire- check the wire feeding the high beam circuit from the hi-lo switch to the connection at the grille. Two grommets that this (and other wires) pass through; one at the firewall into the engine bay, and the other through the radiator core support. The grommets could be missing/damaged- look closely for rubbing on the wire shielding and bare wire exposed, and shorting to ground. The strobe effect I am dreaming that this could be the problem. Turn on your high beams with the key off- strobe effect gone? If the high beams are bright and steady with the key off and strobing while running, then you most likely have a short. With the engine running (vibration) the wire could be shorting to ground intermittently causing this strobe effect. You could use something non-conductive like a round piece of plastic (weed-eater type trimmer string comes to mind) that you could push into the bottom of the hole carrying the high beam wire, lifting the wire off the bottom of the hole and if your strobe effect goes away, that is where the problem is.

Also don't forget to check and clean your fuse connections at the box as I mentioned before if the above does not pan out. There could be a lot of rocks in the river (corrosion) that will limit current flow. O'Wallaby's? Now that is funny!
Good luck!
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Jim Jantzen
Tempe AZ

63 GMC K1000 Sub restored original
63 GMC C1000 Sub original
65 GMC C1000 Sub OEM modified
72 GMC 1500 Super Custom SWB original
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