new to eagles. unknown relays!?

[88formula]

While diagnosing my no power to the ecm I found all these relays under the hood and I have no clue what they are for... any help would be appreciated.





And what is this guy for? There's a little circuit board inside it?!



More questions!!!! Does anyone have a picture of where the factory foot lamps are supposed to go in the interior? Mine are just laying on the ground.. 

[macdude443]

The box with the circuit board is the diode trio.  That tells the sol-vac to kick in when the rear defrost, A/C or headlight are on.  The footwell lights normally mount to the rear of the package tray.  I've only seen one mounting hole in an SX/4 on the drivers side.  I drilled one for the passenger side.

[vangremlin]

Picture # 3, I have seen the fog light relay mounted in that location before, but can't remember if there might something else that also gets mounted in that vicinity.

[88formula]

Awesome! !! I was wondering where that diode pack was located! And the factory fog lights don't work ether, now I got a place to start diagnosis!

[macdude443]

The factory fog lights (that I've owned, anyway) have all had issues with corroded or burned contacts where the bulbs seat.  They use H2 bulbs.

[Sandeagle]

Isn't the diode trio usually in the alternator?

[amcfool1]

hi, in picture  #1 the small square one is the manifold heater relay, and the larger rectangular one is the horn relay. gz

[88formula]

Sweet!! I'm going to unplug them and test to verify.

I know what your thinking about in the alternator,  there are 3 sets of 3 diodes in the alternator. The diode treo that were talking about on the fire wall is to boost idle when headlights are turned on, or the rear defroster, or the a/c compressor is engaged.

[Sandeagle]

Ok,  you need to tap the gas to get that to engadge. I turned the idle down then turned stuff on and that's why the idle went back up till I turned stuff off.  Thanks

[carnuck]

Sweet!! I'm going to unplug them and test to verify.

I know what your thinking about in the alternator,  there are 3 sets of 3 diodes in the alternator. The diode treo that were talking about on the fire wall is to boost idle when headlights are turned on, or the rear defroster, or the a/c compressor is engaged.

2 sets of 3 diodes in each alternator. (Delco ones) 3 windings in the alt with each stator set having a positive and negative diode to cut the other half of the Alternating current the alternator makes to turn it into Direct current, "rectifying" it.

https://www.youtube.com/watch?v=cyhzpFqXwdA