zf5 issues
Junior User
Joined: Oct 2013
Posts: 51
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I believe I found the backup switch location, but on my '93 vintage transmission, it is located approximately 4 inches in front of the shift tower and about two inches down the driver's side. It must be the correct location since there are no other places where the switch could possibly go. Now I have to figure out how to use my 4-wire backup light pigtail on my 2-wire switch. I have looked through several salvage yards and have not found another 4x4 truck with the ZF transmission and manual shift linkage for the BW transfer case . I'll keep searching. Thanks for the help!
Lead Driver
Joined: Oct 2003
Posts: 8,476
Likes: 37
From: Madison, WI
Yes, that's the switch; it's the only electrical component on the transmission. The original C6 connector has four terminals because two of them are for the start circuit and two are for the reverse lights. If the truck is starting from the key, then the two for the start circuit are most likely jumpered. The other two would be for the reverse lights. Do you have an EVTM? That would tell you, based on insulation color and terminal position on the connector, which terminals are which.
Junior User
Joined: Oct 2013
Posts: 51
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Yes, I have a complete 18 page '87 Truck Vacuum & Wiring Diagram publication, so I can find what wires go to the backup light. But what can I do with the other two wires? You say "jumpered". Do you mean connecting them together?
Lead Driver
Joined: Oct 2003
Posts: 8,476
Likes: 37
From: Madison, WI
Most likely the other two wires are already connected together (i.e. jumpered). Either that, or some other wiring from the ignition switch to the starter relay trigger terminal must have been run following the tranny swap.
Is the old switch from the C6 still on the connector?
Is the old switch from the C6 still on the connector?
Junior User
Joined: Oct 2013
Posts: 51
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I haven't connected them together, but I am thinking that is what I will do. I am taking the original wiring harness ('87 F250 XLT Laredo, extended cab, 460 engine and C-6 transmission) and using it for my conversion to a 351 with a ZF transmission. Since I have no emissions equipment on the engine, there are lots of connections that don't go anywhere. It is proving to be difficult in finding out how to terminate those connections while keeping all the desired equipment working.
Junior User
Joined: Oct 2013
Posts: 51
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I'm not that far along. I have the re-built engine, transmission and transfer case installed. The interior is completely re-done and all window glass, U-joints, brakes, bearings, shocks, steering gear, alternator, starter, AC compressor, PS pump, etc.etc. are new. I'm just getting to the wiring, but I have re-built the steering column and I'm sure it will start with the key when I'm done.
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