you asked:<<How's a fast glow plug different, in use?>>>
The original GPs are wires in *series* - hot lead goes to #4 GP from the
main fuse on the firewall - then thru the GP to #3, thru #3 to #2 and finaly
thru #2 to #1 where a ground wire is attached. A failure in one GP will
result in weaker current to the downstream GPs.
The Fast Glow plugs are wired *parallel* - - where a hot lead comes from
the main fuse on the firewall, and attaches to the #4 GP and then the hot
leads are wires together to electricity goes to all 4 GPs equally - and are
not afected the same if one GP fails.
This allows all 4 GPs to heat up dramatically more quickly that before - the
chart in the workshop manual shows the GPs reaching 1800F in less than 20
seconds.
With the Fast Glow Plug kit you'll get dramatically quicker starts in much
colder weather - and sometimes solve "hard to start" problems that some
shops can spend a fortune of *your* money looking for solutions to - when an
$85 kit will fix it. . I've heard of 2 different people being sold head
jobs when fast glow plugs have fixed their problems -
If I've explained this incorrectly, please help me out - electrical stuff is
my weakest area -- I always have trouble remembering which is series and
which is parallel.
Sincerely,
Larry T ('74 911, '67 MGB, 78 240D)
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