Mark VIII High/Low Question

J

JoshMcMadMac

Registered
I am hoping somebody here might know this one. With the Mark VIII fans, they have a high and low connection. When the high lead comes on, does the low stay on as well or do they "alternate" so that only one of the two gets voltage at the same time?
 
I'm not sure what you're trying to accomplish, but the T-bird fans are two speed and literally identical???

The Mark VIII cooling fan is a variable speed setup.

Maybe best to inquire on TCCoA. :rolleyes:
 
driller said:
I'm not sure what you're trying to accomplish, but the T-bird fans are two speed and literally identical???

The Mark VIII cooling fan is a variable speed setup.

Maybe best to inquire on TCCoA. :rolleyes:
Click to expand...

Not a bad idea! The wife has a Grand Prix, with dual electric fans. I would like to upgrade it, but all of the good/cheap/readily available "upgrade" fans I know of are like the Mark VIII fan with just one fan. Also, now that I have opened the can of worms, I am curious to learn more about the application of the Mark VIII fan, like the third connector on it that does not do anything. I am going to have to take my meter to the Pontiac myself, though, as those guys are telling me that the two fans get power in series for low speed and parallel for high speed...that seems weird to me. :confused:
 
When I used a M8 fan in my 88 Stang I just used the High speed line that way it ran cool all the time.
 
The Mark fan that I cut open to remove the power connector had both B+ pins
tied together just inside the housing, behind the connector.
Double connections help with the current load coming in, but there is no chassis
ground on the fan housing and only one wire for B- going out (no net current gain).
Must be a case of Ford engineers reaching into the T-Bird parts bin and using
a two speed connector (3pin) for a variable speed application (only 2 pins needed).

Mel C.
93 garnet/grey X2
Garage Queen w/ Ugly Twin
 
Melmark93 said:
The Mark fan that I cut open to remove the power connector had both B+ pins
tied together just inside the housing, behind the connector.
Double connections help with the current load coming in, but there is no chassis
ground on the fan housing and only one wire for B- going out (no net current gain).
Must be a case of Ford engineers reaching into the T-Bird parts bin and using
a two speed connector (3pin) for a variable speed application (only 2 pins needed).

Mel C.
93 garnet/grey X2
Garage Queen w/ Ugly Twin
Click to expand...

Wow, thanks. That is some great homework you did there.
 
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