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Car Forum / Dodge / Dodge Trucks / November 2007

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Strange electrical problem - '91 Dakota

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Bruce Porter - 22 Oct 2007 18:29 GMT
First thing the other morning, the Brake Warning light (red one, not the
ABS one) came on and the blower wouldn't blow.
When I turn the blower switch off, the brake light goes off.
Also, in reverse, the reverse lights don't work, and the same brake
warning light goes on.
I notice in the wiring diagram, that the blower motor & reverse lights
get power from the same point on the ignition switch.
But I don't see the connection to the brake light.
I assume I've got a bad connection or ground somewhere, where to get
started?
Ed H. - 27 Oct 2007 01:21 GMT
Sounds like a bad ground somewhere; instead of the current going to ground
through the normal/correct route, it's backfeeding into the common power
source.  I would start by inspecting the ground at the brake lights, only
because they are probably more susceptable to corrosion.  Next I would check
the blower circuit.  If you don't find a bad ground at either location,
inspect the ground for every component shared by the common power source.

I've seen really weird things happen from a bad ground...

> First thing the other morning, the Brake Warning light (red one, not the
> ABS one) came on and the blower wouldn't blow.
[quoted text clipped - 6 lines]
> I assume I've got a bad connection or ground somewhere, where to get
> started?
Bruce Porter - 08 Nov 2007 17:19 GMT
The blower motor was old and drawing too much current.
It fried the ignition switch & it's wiring harness.

> Sounds like a bad ground somewhere; instead of the current going to ground
> through the normal/correct route, it's backfeeding into the common power
[quoted text clipped - 17 lines]
>> started?
>>    
TBone - 08 Nov 2007 22:34 GMT
Sounds to me like someone oversized a fuse as well.

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If at first you don't succeed,  you're not cut out for skydiving

> The blower motor was old and drawing too much current.
> It fried the ignition switch & it's wiring harness.
[quoted text clipped - 19 lines]
>>> I assume I've got a bad connection or ground somewhere, where to get
>>> started?
Bruce Porter - 12 Nov 2007 13:01 GMT
That would be Dodge?
30 amps is an awful lot.

> Sounds to me like someone oversized a fuse as well.
Ed H. - 09 Nov 2007 04:06 GMT
I'm glad you found the problem.  Thanks for the update.

> The blower motor was old and drawing too much current.
> It fried the ignition switch & it's wiring harness.
[quoted text clipped - 19 lines]
>>> I assume I've got a bad connection or ground somewhere, where to get
>>> started?
 
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