The GMC CCKW

What is this doohicky for?



It looks like some kind of capacitor. It was on the lower louvered panel on the passenger side. There are 2 and one is attached to each wire going to the headlight.

Neil

That's part of the original "suppression system" for radio interference
Keep all those little doo-dads collectors such as myself are always looking for such items often missing on a "period correct restoration "

Hope this helps
John

So they aren't necessary for the headlights to work?

Since there seems to be a ground strap every 12" or so, I am thinking this is a radio suppressed vehicle. Were they all radio suppressed?

Neil

They are not necessary for the headlights to work.

All the ground straps and filter boxes on the cowl (if you have them) are part of the supression system on the later trucks to prevent electrical noise from giving away the trucks positions or interfering with other equipment like radios etc.

That is what the "S" is in the serial number on the hood. If the truck had the supression system installed, the serial number would be: 4nnnnnnn-S

Any of that suppression system stuff you want to dispose of ,I would gladly purchase from you.

Thanks
John

Any of those filters, either the round ones or the squarish ones on the cowl and elsewhere will only do harm if they short out to ground internally with is a very rare occurence.

Unless the wire going to them is all frayed or cracked, leave them.