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

[cengles at cox.net]

Dear Forest,

I not only consider the Jon Haas relay upgrade---I definitely want one. I just need to finish this current engine and then........it may be time. They certainly look impressive on the website and the Forum feedback on them is quite favorable.

Warmest regards, Chuck Engles


---- Forest Majors <oldveloce at comcast.net> wrote:
>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
>>
>>
>>
>>
>>
>