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Power loss when heater is running


Mlmartz

New member
Joined
Mar 23, 2023
Messages
1
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Vehicle Year
1988
Vehicle
Ford Bronco II
Hi Everyone. My 88 is having an issue where upon starting it idles really rough when the heater is also going. Once the heater is turned off, RPMs return to normal and everything is good again. If I'm driving with the heater on it will not accelerate, it will sputter but not die. Just no power at all and again when the heater is turned off it's back to normal. I know this is an electrical issue but I'm not sure where to start or how to diagnose it. Any help is appreciated.
Thanks!
 

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