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Thread: CAN Bus Question

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  1. #1

    Default CAN Bus Question

    I’m in the processing of getting all my components together. I have the Digital Dash, I purchased the 8 foot CAN Bus extension cable to connect to the harness, which is under the hood in front of the fenderwell. Then the short twisted cable would connect the extension to the CAN Bus connector in the harness. My question is, do I need to run a longer twisted pair wire, or is the extension wire shielded? A little insight would be much appreciated.

  2. #2
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    Dec 2009
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    Default

    It looks like Holley's shielded harness (contact Holley Tech Service for confirmation), and you don't need a longer twisted pair harness.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  3. #3

    Default

    Thanks for the input. I called Holley today and that is correct. I can use the extension harness with the short twisted adapter harness. They also informed me that the new main harness CAN Bus connector have four wires, so the that Digital Dash harnesses plugs right in, and gets its power & ground from the ECU to power up the Digital Dash & CAN Bus signal. Hopefully I’m giving correct info from Holley.

  4. #4
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    Yes, that's correct and it's in the Digital Dash instructions. Thanks for the update.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  5. #5

    Default

    This is for sure good to know. I received my Digital Dash yesterday. I do have a question. I may have read this wrong, but to read things like oil/fuel pressure, I would still need to get and additional harness 558-433 or 558-434, correct? Since the sale is going on, I want to order whatever I need or my pocket allows.

  6. #6
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    Dec 2009
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    Connecticut
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    Quote Originally Posted by robertc68 View Post
    I received my Digital Dash yesterday. I may have read this wrong, but to read things like oil/fuel pressure, I would still need to get and additional harness 558-433 or 558-434, correct?
    No, it communicates that data with the Holley EFI ECU. Those harnesses are for wiring extra I/O directly into the Digital Dash itself, such as a fuel level gauge.
    http://documents.holley.com/199r10746rev1.pdf (Holley 553-106 Digital Dash Instructions - "Optional I/O Connector", Page 45)
    https://www.holley.com/products/acce..._touchscreens/ (Digital Dash, I/O Adapter & Vehicle Harness Kits)
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  7. #7

    Default

    OK, I'm a bit behind and finally getting around to hooking up my Digital Dash. I have a black & white wire, one is for ground, the other power. I'm thinking they don’t need to be wired to anything, correct?

  8. #8
    Join Date
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    Connecticut
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    The wiring instructions is in the Digital Dash manual (LINK). It depends which generation main harness you have (2 or 4 wire CAN Bus connector).
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  9. #9

    Default

    I realize that, my question was in regard to the above post #3. I thought maybe there was a change in the wiring. My directions say to hook up the black & white wire. With saying it get its power from the ECU, it made me wonder if those wires still needed to be hooked up.

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