headlight relay (again)

[mrm930]

Hello all,
A while ago I purchase a blade conversion kit from fellow pelican Fred Cook. Getting ready to wire it, however I can't find the original wiring diagrams. I have searched here, but only to find relay wiring using 4 wire relays - mine are 5 wires.

I think I have figured it out looking a several threads - but then a problem comes up with the fifth wire - and two of the threads I looked have looked at, have conflicting info.

Bottom line - anyone have a copy of the instructions. Mush appreciated

Thanks,
Mark

[86 911 Targa]

Model/year of your car?

Gerry

[mrm930]

78 930

[Tremelune]

I don't have instructions, but the relays are standard Bosch automotive relays. They're all wired pretty much like this:

[mrm930]

thanks, but I need one for a 5-wire relay. This diagram shows a 4-wire out.

The 5-wire relay has 2 - 87 terminals (not 87a and 87). I there is a yellow wire to one and a blue wire to the other. I am sure they go to the top of the fuse block, but in what configuration.

Thanks again for posting

[mrm930]

on the relay is a diagram that shows when power is sent to 85/86 pair..... this engages the siwtch for a connection of #30 to both #87s.

Maybe I should switch these out for a 4-wire. But this is how the kit came to me. Not sure if Fred Cook is still a pelicanite. I have searched here for hours, and can not find any wiring diagrams specific to the relay set up in this kit

[Synchro Joe]

Fred Cook is still on PP, you can do the 'go advanced' search for Fred and use the drop down link.
Timmy2 is also a great PP resource for all things 911 electrical.

Also see info here:
https://rennlist.com/forums/911-forum/840698-unsolicited-praise-fred-cook-s-replacement-fuse-panels.html

[timmy2]

Draw out the relay schematic.
You don’t need an 87a for headlight relays.

The double output on 87 (2 poles/contacts with the same normally open function) just means you run both to feed the top fuses for high or low beams. For low beams top of fuses 5&6
For high beams it is 7&8
Counting from the right side starting at the headlight.

Fred’s panels didn’t have internal jumpers, so dual output eliminates the need for jumpers.

Wire from 86 goes to the original top fuse wire for high or low beams (white or yellow)
Wire from 85 goes to a good ground.
Wire from 30 goes to a fused power input. (Battery or constant hot on fuse panel)

Repeat for second relay for high or low, depending on which you did first.

[mrm930]

Thanks Timmy

Okay - I have been jacking with this for awhile and my mind is mush.
87 - running wires to top of fuses..... spliced with the one there or do these run thru the relay. Same on the bottom. Spliced or runs thru the relay?

Basically - the relay sets wiring sets between the top and bottom wires to the fuse. If so, then the original wiring run into the relay and the relay out goes to the fuses - replacing the original position of the factory wiring?

Thanks

Originally Posted by timmy2

Draw out the relay schematic.
You don’t need an 87a for headlight relays.

The double output on 87 (2 poles/contacts with the same normally open function) just means you run both to feed the top fuses for high or low beams. For low beams top of fuses 5&6
For high beams it is 7&8
Counting from the right side starting at the headlight.

Fred’s panels didn’t have internal jumpers, so dual output eliminates the need for jumpers.

Wire from 86 goes to the original top fuse wire for high or low beams (white or yellow)
Wire from 85 goes to a good ground.
Wire from 30 goes to a fused power input. (Battery or constant hot on fuse panel)

Repeat for second relay for high or low, depending on which you did first.

[timmy2]

You don’t touch the original bottom wiring of fuses 5-8. Those go directly to the headlights.

For low beams select one relay.

You take the original top of the fuse yellow wire from 5 or 6 and splice it to the wire connected to 86.
You run 85 wire to ground.
You run 30 to fused power.
You run the 2 87 wires to the top of the fuses 5 and 6.

For high beams using the other relay.

Splice the original top of the fuse white wire to the wire going to 86.
Ground 85
Run fused power to 30
Run the 2 wires from 87 to the top of the fuses 7 and 8.

[mrm930]

thanks

appreciate it Mr Timmy

[86 911 Targa]

^^^^^
Headlight relay wiring.



^^^^^
These pics will show you how to run your fog lights independent of your headlights.

Don't remember the headlight kit I used (a long time ago)...

These pics are for our M/Y 1986 Targa.

Good luck,

pm me as needed.

Best,

Gerry

[timmy2]

Originally Posted by mrm930

thanks

appreciate it Mr Timmy

Post a photo or two of what you have done…