1970 RoadRunner heater problem

ams340mag · Dec 29, 2015

Hello
i have a 1970 Burnt Orange Road Runner in great shape
except for the wiring from the heater control to the heater box
There is no AC
There are four connector spades at the heater box
the piece the spades connect to is broken but I can make another
how do the four wires connect?
Thanks
AMS340MAG

dodge1972 · Dec 29, 2015

Heater block is a resistive device. Multiple inputs with a single output. If your heater switch has two or three positions the resistance block with have two or three inputs with one out. Using a dc meter check the inputs to the block as you move the switch from off to low-med-high. Voltage will identify the corresponding input. The output from the block with feed the motor. Not sure this helps but its a start

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ams340mag · Dec 30, 2015

dodge1972 said:
Heater block is a resistive device. Multiple inputs with a single output. If your heater switch has two or three positions the resistance block with have two or three inputs with one out. Using a dc meter check the inputs to the block as you move the switch from off to low-med-high. Voltage will identify the corresponding input. The output from the block with feed the motor. Not sure this helps but its a start

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View attachment 299464

Thanks that is a perfect start
i am installing a new dash wiring harness
snd the connectors don't seem to match the spade
configuration.
-

ams340mag · Jan 1, 2016

The four resistor spades do not fit the position
layout of the female spade connector

does anyone have any suggestions on how to make connections
properly?
i have two three prong female connectors
one from the heater and one from the
wiring harness
how do I make connections work?
i would expect one connector to be male

please advise
Toams340mag

joemish · Jan 1, 2016

get a shop service manual. the correct wiring will be there.

6pktgo · Jan 3, 2016

69/70 Dedforst unit, no air

Does your existing plug connector look like this? The triple goes to the resistor & the single black ,at the back goes to the motor.

ams340mag · Jan 4, 2016

Yes it does. The resistor spades do not have the same pattern

1970 RoadRunner heater problem

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