Firewall electrical plug pin-out diagram?

[BigSix]

I need some info on what the wires to the firewall plugs are doing.

The large connector by the brake master melted on mine so I am just going to run the wires through a grommet.

Also looking to sub in a blade fuse block - so any information on which one would be awesome.

I didn't find anything in a search but if this has been covered so sorry - just let me know where.

[The Rocknrod]

You should be able to use this:

[DPowers]

http://67-72chevytrucks.com/vboard/s...d.php?t=378484

[PGSigns]

If the harness is that bad and you want a new fuse block I would put a new harness in the truck. I did it in my 65 after trying to fix what I had to no avail. Every time I went to work on the truck something else would not work. I went with american auto wire in mine and would highly recommend them.
Jimmy

[BigSix]

Originally Posted by PGSigns

If the harness is that bad and you want a new fuse block I would put a new harness in the truck. I did it in my 65 after trying to fix what I had to no avail. Every time I went to work on the truck something else would not work. I went with american auto wire in mine and would highly recommend them.
Jimmy

Inside the cab the harness is like new. Under the hood the harness is fine but I pulled the stock V6 and put a diesel in there. Along with the swap came different alternator/regulator setup. So really I should say that I am rewiring under the hood.

If I wanted to keep the large firewall connector that is by master cylinder would there be a source for a replacement?

[ray_mcavoy]

Originally Posted by BigSix

If I wanted to keep the large firewall connector that is by master cylinder would there be a source for a replacement?

Those are Packard/Delphi 56 series connectors. New terminals for them are readily available from a number of sources (including many local auto parts stores). However, the plastic connector shells used in this location are somewhat specialized. And I don't think replacements are readily available (at least not without buying them as part of a new reproduction harness).

So the only other option would be to find a junk harness that still has those connectors intact. Extract the old terminals/wires, clean up the plastic connector shells, crimp new terminals onto your wires, and insert them into the appropriate cavities.

[The Rocknrod]

Originally Posted by BigSix

...If I wanted to keep the large firewall connector that is by master cylinder would there be a source for a replacement?

American Auto Wire has them. Here they are on ebay:
http://www.ebay.com/itm/391131380023...%3AMEBIDX%3AIT

[mark 66]

just went thru what pg signs did. highly recommend buying new harness.just got it from mcb matt. good price high quality.

[The Rocknrod]

Does the American Autowire kit come with the firewall connector like ours? What is the kit number?

[BigSix]

Thanks guys - so I checked the harness I have and its actually great. Really good.

So here is the next issue: since I no longer need the voltage regulator, or anything distributor/coil related, what do I hook up to get 12V to the harness. Can I run the 12V Red wire direct from the battery to the wirewall connector instead of to the horn relay first? My 1 wire alternator doesn't need to sample from the horn relay so I figure it would make most sense to send 12V straight through the red wire to the firewall connector on the driver side near the master?