Resistors?

[Brent B3B]

little background, My B3HH ("Rob") was ordered by the Navy and then what I would guess acquired by a fire department. With that, there is an extra battery box under the drivers side hood and a switch on the dash for the batteries.

I have what I call "resistors" at the ignition, coil (neg side) and at the generator (photo)

I haven't seen these on my other trucks so, I wonder what is the function, are they really necessary, can they be tested?  

[Plymouthy Adams]

capacitor...purpose, filtering....

[B1B Keven]

Capacitor. Yes, they can be measured. Usually rated in micro farads.

[Merle Coggins]

Yup.. like they said. It's a capacitor. They are used to suppress electric interference for radios.

[Brent B3B]

I was going to PM a couple of you, but I figured I'd ask on the forum incase someone else doing a search had the question.

you all three receive "best answer"  

thanks guys!