If you mean the van type. Same as a spark plug, they just unscrew. unfit the wire could be clip or bolted on, then unscrew it.
What makes you think you need to? You can check them using a car light bulb, wire it in series with the plug, if the bulb light, plug ok, if no light plug open cct
SD
October 2011
Automatic Answer
While you wait for answers, we may have found some information which could help you.
howtomendit.com for free repair help, information and advice.
