Need advice on what to fix

Tiny
LOGANT
  • MEMBER
  • 1983 MAZDA RX7
  • 4 CYL
  • RWD
  • MANUAL
Having Mazda rx7 wiring issues. No power to anything but headlight motors
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Saturday, March 7th, 2015 AT 8:30 PM

5 Replies

Tiny
CARADIODOC
  • EXPERT
Do you mean nothing else works? No head lights? No interior lights or radio? What history led up to this? There's a number of fusible links for various circuits, but it's unlikely all of them are blown. Did this problem occur all of a sudden?
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Saturday, March 7th, 2015 AT 9:32 PM
Tiny
LOGANT
  • MEMBER
The car has been sitting for a few years and nothing has power but the head light motors, it goes up when u flip the switch. I just got the car from the neighbor and am trying to bring it to life but can't figure it out. We hook up the battery and the head lights used to turn on a few days ago but that was it. We tested some wires to ignition and it seems to have power but everything is just dead. Dosnt make much sense
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Saturday, March 7th, 2015 AT 9:41 PM
Tiny
CARADIODOC
  • EXPERT
Dandy. I guess we can pick any circuit to start with. Best is to use a test light. For these tests that will be more accurate than a digital voltmeter. Start by testing for voltage between the large post on the starter motor and a paint-free surface on the engine block. The test light should light up brightly.

Leave the probe on the starter and move the ground clip to a paint-free bolt head or some other point on the body. Test light should light up again. Turn the head light switch on during these tests, even if they don't work, because that will cause current to try to flow, and that will make some defects show up easier.

From this point you can leave the ground clip on the body. Check for voltage on the large, bolted-on output wire on the back of the generator. Let me know if any of these voltages are missing. If they're not, we'll have to look at the next group of circuits.
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Saturday, March 7th, 2015 AT 10:02 PM
Tiny
LOGANT
  • MEMBER
Is there any main fuse that would make it have no power? If so which one? Thank you
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Saturday, March 7th, 2015 AT 10:15 PM
Tiny
CARADIODOC
  • EXPERT
No. That would be too easy. There's a number of fuse link wires.
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Saturday, March 7th, 2015 AT 10:19 PM

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