{Chrysler 300} Fuel senders and autopilot

[John Grady <jkg@xxxxxxxxxxxxxxxxx>]

As part of another issue , I got into rebuilding a fuel sender on 58 mopar . (57-59) —may be earlier too  .Added Ford brass tank float, got rid of cork . Those senders work with a  magnetic type gauge indicator , instant read — you can see needle bounce around with fuel slosh .  Magnetic design needs no gauge regulator , it works on a differential magnetism principle between two balanced coils ( watch out for needle sticking at E end = nothing wrong with sender or gauge , that can drive you crazy , you go over bump it suddenly starts  working  — have to add a stop of wire etc to keep  the needle lowest place  just at the E or C 
Anyway , I measured the mag sender ; it is about 20 ohms (f) to 200 empty . The later thermal sensor is about 10 F to 90 E . So cannot work right if interchanged . 
time lag of heating design gives a more stable pointer but old  style is probably more accurate . Same ohm range must apply to the  correct temp sender too . 

 On Autopilot , big thanks to Don Cole for info on it . Manuals are really poor — calling out pins 1,2,3 in the troubleshooting section while wiring diagrams are labeled  only with unrelated colors and harness numbers. No real functional description of “ the how” either or schematic diagram . 
Actually fairly simple electrically ,(  I think) , other than very poor documentation . 

The question is about the second hydraulic switch (on MC ? initially?) that releases the autopilot if you hit brakes.  I Saw one installed at Hershey with a tee under MC , two switches . 
It seems ( from logic of wiring) to be a normally closed switch that opens with brake  pressure , the opposite of a brake light switch ( the arrangement inside it ) .
Missing on my car — and unobtanium ? 
Comments  welcome , I can probably make it work with a relay off of one switch , but original is possibly safer . 
thanks , 
John 
Sent from my iPhone

-- 
For archives go to http://www.forwardlook.net/300-archive/search.htm#querylang
--- 
You received this message because you are subscribed to the Google Groups "Chrysler 300 Club International" group.
To unsubscribe from this group and stop receiving emails from it, send an email to chrysler-300-club-international+unsubscribe@xxxxxxxxxxxxxxxx.
To view this discussion on the web visit https://groups.google.com/d/msgid/chrysler-300-club-international/9DE3FCFA-135B-45C4-9CE9-71AFBD27FCDD%40gradyresearch.com.