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Reply to "Question Regarding Fords with Factory Tachometers"

I have installed these 'Ignition Power Relays' in early and later cars. The note below the 'OEM Power to Coil' wire about a possible 1.35 ohm resistance wire is applicable to the later cars. Despite the resistance, that wire will energize the DIN relay, and it will also de-energize when the key is turned off.
The early cars with the ballast relay mounted on the firewall uses a regular non-resistance wire as the 'OEM Power to Coil' from the key switch. Unless one of the DIN relays with a resistor or a diode across the relay coil is used, it will NOT disengage due to the very slight back feed of +12v to the circuit through the 'GEN' light bulb and resistors back in the dashboard keeping the relay coil engaged. Much less power is required to hold the coil than to energize it in the first place.
At least that's what happened to me.
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