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> Rewiring, Should I go ISIS multiplex or "old school analogue?"
swl
post Dec 19 2010, 08:13 PM
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This has an enormous cool factor to it. If you were doing a custom car, starting from scratch it would make life easy and fun.

I would have a little hesitation though about trusting essential systems to it. If you lose the ISIS you would be dead in the water. Of course that holds true to a lesser extent even with the stock setup. Lose the fuel pump fuse or relay and you're dead in the water (BTDT)

Don't kid yourself though that it would make the rewire simpler and faster. You have to figure out how it is all going to work, determine your fusing, route all the inputs and outputs, program, test ... And of course you would want to convert to LED and HID and and and ... Buy the right stock harness and it is plug and play.

That said, I think I would do it. The entertainment factor would be worth the $1K You would sure know your electrical systems by the time you are done. And that low voltage switching would make 'check your grounds' a thing of the past.

Go for it! Get the progress thread started!
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Jake Raby
post Dec 19 2010, 08:20 PM
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What I like about Isis is a lesser amount of connections and lower voltages on the switched leads.. It's a solid state unit that distributes load from main power cells at with a direct power feed.

Plus all the connections are cannon plugs with military grade connectors. It works alot like modern avionics..
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BIGKAT_83
post Dec 19 2010, 08:30 PM
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You could make a network yourself with one of the newer micro plc's and even put a HMI in as the centrial unit for $400 or less.
When I first saw the ISIS a couple of years ago I priced out the parts to do something like this at Automation direct.


Bob
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Dr Evil
post Dec 19 2010, 09:16 PM
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(IMG:style_emoticons/default/agree.gif) I was an avionics tech for 4 years and looking at this system I see a good idea that is not quite finished or is too much.

I was thinking it would be easier (less parts, less wires) to have a data bus system, that way you could use one coax wire that would have several signals traveling over it. Then ad solid state "relays" at each destination. One major wire from fore to aft with feeders coming off for various things. You could at least do this for electric gauges so all gauges are on one wire. Seriously clean.
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Jake Raby
post Dec 19 2010, 10:03 PM
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QUOTE(Dr Evil @ Dec 19 2010, 08:16 PM) *

(IMG:style_emoticons/default/agree.gif) I was an avionics tech for 4 years and looking at this system I see a good idea that is not quite finished or is too much.

I was thinking it would be easier (less parts, less wires) to have a data bus system, that way you could use one coax wire that would have several signals traveling over it. Then ad solid state "relays" at each destination. One major wire from fore to aft with feeders coming off for various things. You could at least do this for electric gauges so all gauges are on one wire. Seriously clean.


It actually can be configured in that manner, or at least similar to that. Thats the way I'll be wiring my unit.
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Dr Evil
post Dec 19 2010, 10:08 PM
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Hmm, then the value of this system goes up considerably.
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JeffBowlsby
post Dec 20 2010, 02:33 PM
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Hi Phil,

I checked my inventory, I do have 2 complete 1972 model year chassis harnesses. Let me know if you want one.

Thanks.
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McMark
post Dec 20 2010, 04:16 PM
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It just doesn't seem like the ISIS saves you much, especially when you factor in cost and installation time. Maybe if we had more complicated wiring, or our cars were bigger. The ISIS system doesn't change the number of wires to the components (taillights, headlights, engine, gauges, etc) it simply allows you to swap the long runs of multiple wires to a long run of a few small wires. The full harness is around 14 lbs. I highly doubt the overall weight goes down much in our cars. I think you would see more benefit by building a replica harness, but with smaller wires for things like gauge signals (OE uses 18g) and leaving off the sheathing.

Lots of work and lots of money for very little benefit. What am I missing?
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SirAndy
post Dec 20 2010, 04:42 PM
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QUOTE(McMark @ Dec 20 2010, 02:16 PM) *
What am I missing?

Apparently, there is a *cool* factor to this that we (you and me) are missing ...

Maybe if they delivered their harness in stainless steel or chrome wrappings. Instant BLING! (IMG:style_emoticons/default/laugh.gif)
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swl
post Dec 20 2010, 06:31 PM
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QUOTE(SirAndy @ Dec 20 2010, 02:42 PM) *

QUOTE(McMark @ Dec 20 2010, 02:16 PM) *
What am I missing?

Apparently, there is a *cool* factor to this that we (you and me) are missing ...

Maybe if they delivered their harness in stainless steel or chrome wrappings. Instant BLING! (IMG:style_emoticons/default/laugh.gif)

buncha ludites. Why do things simple and cheap if you can do it high tech and expensive? (IMG:style_emoticons/default/stirthepot.gif)
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