Dargon

Hi guys, so I recently got my 91 RX-7 non turbo convertible, and we about got it running when the starter power wire started sparking against the ground. Disconnected the battery, reconnected it and now the car has no power. the car grounded itself out, traced it down to the room fuse and the sketchy radio wiring that was put in the car connected itself to everything.
Car is no longer grounding out but we no longer have power to anything on the inside of the car, tried disconnecting the antitheft and still nothing
any ideas?

KansasCityREPU

iTrader: (9)

Did you look at the fuses under the hood near the battery?

Dargon

I did, we had to replace the 100A main fuse and the power in the cab worked for a second and went out, fuses still checked out good

Venturer

Look at this thread i opened:
https://www.rx7club.com/2nd-generati...-work-1165548/

After i worked near the clutch pedal for adjusting the pedal clutch rod........the car don't start anymore!

I have no voltage to the fuel pump!

Because i don't believe in coincidences......i checked everything.........all relays, fuses, fuel pump and so on! All components are working!

The only explanation is that when i was working with the clutch rod pedal i touched something near the steering wheel.........a fuel pump kill switch installed by the previous owner as anti theft measure!!!!

I had to find this switch but i won't be easy because for sure it's hidden well!

Dargon

The problem I’m having is before there was buzzing coming from behind the dash and i was able to crank the car
the issue I’m having now is nothing is reacting to the key cycling or even having the door open, horn doesn’t work nor can i turn on any lights.
i have 12V to the normal fuses and to the ignition switch yet nothing is happening

gsmithrx7

Long story short, while trying to check my A/C compressor, my mechanic installed a higher amp fuse that kept blowing out. The Blower motor would not function after that!

Dealer said I needed to replace the resistor on the heater box but he could not order it, I had to do it. I purchased a new resistor and brought it to the dealership. Oops, your heater does not use this resistor, it was built in the late part of 88 and your heater box is from the 89 model year!

But, we grounded the blower motor and it works but only at full blast. Ok I said to ground it with a toggle switch, so that I can at least clear my windshield when I need to.

Now, let the fun begin! Even with the switch turned to the off position there is a parasitic drain on the battery! Dead battery in a couple of days. WTF

Driving down the highway while the switch is on, the alarm system goes off, horn beeping, lights flashing, but still going along. Glad it did not shut down the engine while doing this. I switched off the ground and the alarm silenced itself. I drove awhile then switched it back on and it did not repeat the alarm.

All this crap from just grounding the blower motor, it seems everything is connected to everything else. Then I discovered about negative switching, I have enough trouble with normal car electrical setups!

Please give me a clue as to what is going on with RX-7 electrical systems. I understand batteries, bulbs, and fuses but not much else. This stuff makes me leery to muck around with a multi-meter on my own. But I am willing to put in the time to learn about this part of working on autos.

Jeff76

This kind of look a bit like thread jacking but I will try here.

Was the issue ever fixed that caused the blown fuse? If not, start there. Second, not all mechanics are good at electrical. Find yourself a mechanic that doesn't do such stupid things with peoples cars. This could have fried many components. I know this sounds harsh but doing what they did is just beyond foolish.

I am lucky, wiring came fairly easy to me, reading schematics didn't. If you want to learn, it is a worthwhile project. Considering the possible damage the mechanic may have caused. Try disconnecting the harness and any other wiring to the blower and see what happens.

gsmithrx7

I just recalled another mazda dealership screwing, they charged me $106 back in 1993 to fix an alarm issue. They replaced the hood latch!

I just removed it to refinish it and found that they cut the wires from the contact switch and left the connector in the harness by the horns. with the wires neatly clipped off.

So instead of fixing the alarm malfunction they just cut the connection on the switch which stopped the problem. The original hood latch was working fine, they could have just cut the wires and charged me a few bucks!

I am going to try to fix this going forward. If I can't find anyone who can without screwing up the system, I might just disconnect the entire thing.