SA Electrical Help

[chibikougan]

There is a blue and yellow that go into the cab for the:

Ignition

Alt Warning Light

a-10 connector...

[chibikougan]

It looks to be a regulator for the alternator... from the 79 wiring diagram.

[chibikougan]

Yeah Voltage Regulator...

http://www.rx7club.com/1st-generatio...pgrade-967330/

[FC Zach]

Most parts stores have the ability to bench test alternators, whether or not this test can be done with your application, I don't know but it's worth a shot.

My guess is the regulator but I'm not familiar with the first gens and their parts.

[FC Zach]

As for the gauge. . . Move the yellow signal wire to the Trailing coil and see if there is no change to confirm that you don't have a defective coil. A failed Leading coil is one reason for a dead tach.

[infernosg]

Originally Posted by chibikougan

There is a blue and yellow that go into the cab for the:

Ignition

Alt Warning Light

a-10 connector...

Yeah, I see it now. The YL (yellow/blue) wire runs from the "L" terminal on the external voltage regulator to the alternator warning light but is also connected to the oil level warning light, coolant level warning light, and tachometer circuits. It's still a question of whether it's the alternator or the voltage regulator and I still don't know how to test them. The only thing I've been able to verify is the is the L terminal doesn't have continuity with the A and S terminals, but does with the others, which is consistent with the wiring diagram. I'm going to dig into the display more tomorrow to see if I can't find a short somewhere.