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Old 09-13-2012, 06:21 PM
jim_hoyland jim_hoyland is offline
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Default Dual MSD 6 wiring with DPDT switch..

I installed a second MSD 6 on my '75 Porsche 914 FI engine as a back up.I am using one (1) coil. A 20amp four pole double-throw switch ( PN 8808 ) was used to switch between the two MSDs.
Because of the proximity of the switches spade terminals to one another, it was a challenge keeping all the connectors in place.

My idea is to use a DPDT switch for the 12+ red wire and use a terminal strip for the coil wires and white trigger wires.

I made up a diagram on an excel spread sheet showing the before and after.

I want to know whether this is gonna have a problem
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File Type: jpeg Dual MSD 6 wiring.jpeg (177.5 KB, 3 views)

Last edited by jim_hoyland; 09-13-2012 at 08:35 PM.
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Old 09-14-2012, 07:37 AM
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msdtech1955 msdtech1955 is online now
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the coil plus ( orange leads) would also have to be switched.
cannot connect those together.
transfer_switch_using_magnetic_trig.pdf
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Old 09-14-2012, 08:41 AM
jim_hoyland jim_hoyland is offline
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Quote:
Originally Posted by msdtech1955 View Post
the coil plus ( orange leads) would also have to be switched.
cannot connect those together.
Attachment 2415
So you are saying a DPDT switch is recommended.

I have used the (FPDT) transfer switch up to now. I attached the wires to the switch using insulated crimp on connectors instead of the screws that come with the switch. This was done to isolate the wires, if I attached them directly to the spades using the screwa, some would short.

Is there a special terminal that works better ? I prefer the FPDT switch, but I can have terminals wiggling loose; or, am I doing this wrong
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Old 09-14-2012, 09:31 AM
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Quote:
So you are saying a DPDT switch is recommended.
yes sir...you must switch the ignition power and coil + leads
when using that set up with a single coil.
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Old 09-14-2012, 11:52 AM
jim_hoyland jim_hoyland is offline
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Thank you. Appreciated the tech support.
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