[DeTomaso] Electro-techno question II: late 74 wiring and Moseley relay kit

[Forest Majors]

Chuck,

Do your self a favor - consider the electronic panel that replaces the 
headlight panel motor relay with modern electronics sold by Jon Hass

Jon Haas
E-mail Address(es):
  jhmotorwerke at yahoo.com

One, it performs the same functions as Rick's relay kit and takes the load 
off of the headlight switch and the turn signal dimmer switch wires.
Two, it replaces that old antiquated prone to problems mechanical relay that 
Bill is talking about.
Three, it effectively reduces the initial load by half by separating the 
headlight lift motor function from the headlight light function.

I have not installed this panel but the specs look great - I have installed 
his fuse panel and the quality is just outstanding.

Best regards
Forest Majors
  ----- Original Message ----- 
  From: cengles at cox.net
  To: SOBill at aol.com
  Cc: detomaso at realbig.com
  Sent: Tuesday, August 26, 2008 10:19 AM
  Subject: Re: [DeTomaso] Electro-techno question II: late 74 wiring and 
Moseley relay kit



  Dear Bill,

  Thank you. Thank you. This is exactly the type of explanation and 
take-me-by-the-hand elementary electrical lesson that I need!!

  You're a prince, Chuck Engles


  ---- SOBill at aol.com wrote:
  >Chuck,
  >
  >Rick's headlight kit has nothing to do with the doors. It adds relays
  >between the headlight switch and the headlights to reduce the current 
flowing thru
  >the switch.
  >
  >
  >The Headlamp door control is no doubt the most complex electrical circuit 
on
  >the Pantera. I'll give a shot at explaining how the sequence operates.
  >First the limit switches:
  >The Doors Open Limit Switch contacts OPEN to stop the motor when the 
doors
  >are fully open (i.e. the doors have reached the FULLY OPEN POSITION 
LIMIT).
  >When the doors are not open ....... the doors are moving to the closed 
position
  >or are in the closed position ..... the Doors Open Limit Switch contacts 
are
  >closed.
  >The Doors Closed Limit Switch contacts OPEN to stop the motor when the 
doors
  >are fully closed (i.e. the doors have reached the FULLY CLOSED POSITION
  >LIMIT). When the doors are not closed ..... moving to the open position 
or are in
  >the open position ..... the Doors Closed Limit switch contacts are 
closed.
  >Now the Headlamp Relay ...... which controls the doors but not the
  >Headlamps
  >The Headlamp Relay reverses the power polarity to the motor so the motor
  >rotates to open or close the doors depending on the limit switch 
positions. With
  >the Ignition Switch in an ON position: If the Headlamps are ON, the doors
  >will open and remain opened: If the Headlamps are OFF, the doors will 
close and
  >remain closed.
  >Now, how does it all work:
  >Assume the doors are closed, headlights are OFF, and the Ignition is in 
ACC
  >or RUN. The headlamp relay shown in Headlamp and Headlamp Doors Page 1 of 
2
  >is deenergized. Power will be applied to the Yellow and Green wires at 
the
  >limit switches. The limit switch condition shown in the top left most 
diagram on
  >the Headlamp and Headlamp Doors Page 2 of 2. Since the doors are closed, 
the
  >contacts of the Doors Closed Limit Switch .... the bottom switch of the 
two,
  >.... the one with the two Brown and one Green wires attached ..... are
  >open. No power will be applied to the motor. This is a stable state.
  >Assume that now the headlamps are turned ON. Since the Doors Open Limit
  >switch is closed .... because the doors are not open ..... a ground 
connection
  >will be applied via the Gray wire, through the Doors Open Limit switch 
and the
  >Yellow wire to the motor. +12V will be applied by a Brown wire attached 
to
  >the Doors Closed Limit switch (but not dependent on the doors closed 
limit
  >switch contacts) to the motor. The motor will turn and the doors will 
start to
  >open. This is the situation shown in the middle-top diagram on page 2 of 
2.
  >This is not a stable state because the doors can not move indefinitely.
  >Assume the doors have opened to the point where contacts of the Doors 
Open
  >Limit switch have opened. Power to the motor has been interrupted and the
  >doors stop moving in the open position. This is the situation shown in 
the right
  >hand-top diagram on page 2 of 2. This is a stable state.
  >Assume now the headlamps are turned OFF. The headlamp relay will 
deenergize
  >and 12V power will be applied to the motor via a Yellow wire which is
  >attached to the Doors Open Limit switch (but is not dependent on the 
Doors Open
  >Limit Switch contacts) and a ground will be applied on a Green wire, thru 
the
  >Doors Closed Limit switch then via a Brown wire to the motor. The motor 
will
  >rotate and the doors will start to close. This is situation shown in the 
left
  >hand-bottom diagram on page 2 of 2. This is not a stable state because 
the
  >doors cannot move indefinitely.
  >The doors move until the contacts of the Doors Closed Limit Switch have
  >opened. Power to the motor will be interrupted and the motor will stop 
with the
  >doors in the closed position. The system has now returned to the same
  >condition as shown in the left hand-top diagram. This is a stable state.
  >The cycle of doors opening, doors staying open, doors closing, doors 
staying
  >closed has been completed.
  >If the Ignition switch is turned OFF anytime during the door movement, 
the
  >door movement will stop.
  >If the ignition switch is turned OFF while the doors are open, the doors
  >will remain open.
  >Please let me know if this is understandable, or if it is too confusing. 
If
  >you go through the above description with the electrical diagrams, you 
will
  >see how it works. Then, considering the trouble symptoms, you will know 
what
  >to test. Every signal you need is available at the limit switches.
  >I have attached the two Headlamp and Headlamp Doors diagrams.
  >Have fun,
  >
  >SOBill Taylor
  >sobill at aol.com
  >
  >
  >
  >
  >
  >
  >**************It's only a deal if it's where you want to go. Find your 
travel
  >deal here.
  >(http://information.travel.aol.com/deals?ncid=aoltrv00050000000047)
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