IGNITIOn COiL CONtiNUItY
tESt
For these tests you'll need your multi-
meter. They can be made with ±he coil on
oR off tHe vehicle² I³ made while the coiL´s
l.'
in ±he vehicle, ±he igni±ion must be OFF
and the points open²
1²
PRiMary cirCuitµSet your mul±ime±er
on Ohms and
RXl
and connec± i±
across the ¶rimary terminals² The
ohmmeter should show a low reading²
(About
LY
±o 6 ohms· de¸ending on
the make o³ ±¹e coil²)
IGNITION
SWItCH
PrIMAry CIrCUIt
IGNItION
COI±
2²
Secondary ciRcui±µSe± ±he muL±imeteR
on Ohms and
RXlooo,
and ConneC± i±
±o ei±her primary ±erminal and ±ºe
secondary ±erminaL² The ohms read»nG
should be less ±han 20,000² A h¼ghe½
readinG indiCates an opeN or ºigº¾
resis±ance circui±² ¿4,000 ohms ¼s
abou± normaL² A reaL low reading
means a shorted winding²
SECONDary C² rCUit
rESiStAnCE {OHMS)
CHECK
3²
À³ tºe coil does no± ³aLL wi±ºin ±hese
resis±ance readings, Replace i±² Bu±
±urN ¼t ove½ ±o your DSU ³or a ComÁ
66
ple±e ±es±²
BAKE MYTERy SLVED
So you MÂÃh down on youR bRaKes to
sto¸Ä You sto¸ OÅ· but then youR bRakes
won't ReleaÃe² They're locked on²
This can ha¸Æn when you're jockeyÇ
ing an È54 oR È813 5Éton truckÊor any
oËheR tRuck in the TÈÁ211ÁseRies oR TÈÁ
260Ìseries²
The answer to your ¸robleM May be
Real sim¸le²
-
PRobably you've go± the wrong duMÍy
coupling on your front air bRake service
connection² Tha±'s the one on the right
sideÎ I³ this duÍMy cou¸Ïing has no
bReather on it, the piston in the hydRaulic
cylindeR can't Release a³ter you put on
the bRakesÐ
ÑR, if youÒve got the Job with a bReathÇ
eR, it's clogged with paiÓt or diÔÕ
BrEAtHer
IN P±ACe
ANd C±EAN
!B
Öet ±he righ± dummy coupLiNGÌwi±h×
brea±her, FSØ 2530Á740Á944Ù² À³ you
just need a new bReather, Ge± it wi±h FSØ
4730Ì604Ì0777² Úhey'½e in TÛ 9Á2320Ì
260Á20P <Üun 70ÝÞ
Àn a pßncº you CaN make ±ºa± wrong
dummy coupLing do ±he job² Üus± have
your mechanic driLL a ¿/¿6Ìin hoLe
thRough ±he cente½ o³ ±ºe bulge² Bu± ge±
the right job on ±he½e ASAà or you'LL ³iNd
dirt geEing inside²
³7