Gen 3 Wiring - Shortcuts?

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PostPosted: Sun Dec 31, 2017 1:08 am
I'm doing my Gen 3 conversion this winter and I'm at the point where I'm removing my old wiring. But the manual says I need to keep my Rain Light wiring.

Well, the rain light wires are tightly wound inside the harness and that strange yellow mesh. Is there a shortcut to carving through the yellow mesh to free the rain light wires? It seems like making new rain light wires would be easier than trying to save the old ones. Ideas???
Kurt Breitinger
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Chassis 494

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PostPosted: Sun Dec 31, 2017 2:21 am
I would recommend that you buy the $495 chassis harness kit. I think it included as new wires for the taillight. Well at least we have a separate wire coming to the tailight with a new connector. One of our main reasons for buying the new harness was our gen2 wires were of the old style.
Having a new install with old wires just seems to be a problem looking for a place to happen. Plus the new wires just cleanup the install and will be trouble free,I hope,for years and years to come.
Tallk with your local CSR for better input to your question.

PS; we are a family run race team and did our own install with a help from Flat Out Racing , just take your time and look at others cars to create the style and assembly you want.
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PostPosted: Sun Dec 31, 2017 1:12 pm
You shouldn't need to cut open the old GEN2 harness and the upgrade isn't that hard. The biggest change in the new harness is most of the connections to the engine are in the new engine harness. You will have to deleted a lot of connections, shorten the starter solenoid wire, and separate any connections from the old ECU harness. The following information should help, it is out of a new conversion manual I am working on. Also, you can go to our website for detailed schematics and wire connection tables at http://www.accelracetek.com

Obsolete Functions/Wires – Dash of Harness

Some of the connections and wire on the old GEN2 hardness are not required for the GEN3. Most of the engine sensors are connected into the ECU with the engine wire harness. The following functions and wires are not required and can be either cut off or removed.

Obsolete Functions/Wires – Dash of Harness
Color Size Connector Function Notes
Lt Green 18 Spade Lug Water temperature gauge
Red 18 Spade Lug Water temperature gauge 12 volts
Black 18 Spade Lug Water temperature gauge ground
Lt Brown 18 Spade Lug Oil Pressure gauge
Lt Blue 18 Spade Lug Tachometer gauge
Red 18 Spade Lug Tachometer gauge 12 volts
Black 18 Spade Lug Tachometer gauge ground

Obsolete Functions/Wires – Engine End of Harness
Color Size Connector Function Notes
Lt Green 18 Spade Lug Water temperature sensor
Lt Brown 18 Spade Lug Oil Pressure sensor
Black 14 1/4” Ring Lug Alternator ground

Retained GEN2 Dash End Connections
The following functions and wires are required for the GEN3. Some of the wires will need to be modified for the GEN3.

Color Size Connector Function Other
Pink 18 #8 Ring Lug IGN switch from Fuse panel 10 Amp
Blue 18 #8 Ring Lug Rain light switch from Fuse panel 10 Amp
Green 18 #8 Ring Lug Rain light from rain light switch
Blue 18 .25” Spade Brake light switch from Fuse panel
Grey 18 .25” Spade Brake light from brake light switch
D Blue 18 F Bullet Alternator charge light from fuse panel 5 Amp
Brown 18 F Bullet Charge bulb to alternator “T” plug
Red 12 #10 Ring Lug Starter switch from master switch Not Fused
D Blue 12 #10 Ring Lug Starter switch from starter switch
Black 12 5/16 Ring Lug Ground to battery ground lug on frame

Data Logger Plug
Color Size Connector Function Notes
Red 18 Spade Lug Old oil pressure gauge 12 volts Now the data logger 12V
Black 18 Spade Lug Old oil pressure gauge ground Now the data logger ground

Retained GEN2 Engine End Connections
The following functions and wires are required for the GEN3. Some of the wires will need to be modified for the GEN3.

Alternator
Color Size Connector Function
Red 18 T1 Battery side of master to charge light
Black 18 T2 Brown field charge from the dash charge light
Green 12 1/4” Ring Lug Alternator output stud to Master switch

Starter
Color Size Connector Function Notes
D Blue 12 1P Packard Starter Solenoid from starter switch Needs to be cut shorter

Brake light connector
Color Size Connector Function
White 18 P1 Splice to black to chassis ground eyelet
Red 18 P2 Splice to grey to brake light switch
Black 12 P3 Splice to green to rain light switch

Master Switch
Color Size Connector Function
Yellow 18 3/8” Ring Lug Switched side of master to Alternator
Red 12 3/8” Ring Lug Switched side of master to fuse panel
Green 12 3/8” Ring Lug Battery side of master to Alternator

Bruce Richardson - AccelRaceTek LLC
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PostPosted: Sun Dec 31, 2017 1:58 pm
Hi Kurt and Happy New Year! Hope to see you at VIR majors.
I bought the new Gen3 harness because my old harness had those old style pesky huge connectors near the battery. My harness also harked from the Renault days giving me a good excuse to replace. I also replaced the large red and black cables to and from our starter. If your harness is new enough and you're patient, using what you have and thanks to guys like Bruce, it can be done. In my opinion, if you have those old style large connectors near your battery, I would not risk using the old style harness.
Good luck!
Mark Fick
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PostPosted: Sun Dec 31, 2017 5:39 pm
Thanks for the advice guys.

I did purchase the new harness, but the manual says to reuse a few wires - some of which are the rain light wires. So, that's what I was trying to do. It appears that my rain light wires run through the smaller harness, so I was trying to carve them out of there. If there are indeed rain light wires in the new harness, I'll give the schematic a hard look to determine where they are.
Kurt Breitinger
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Chassis 494
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PostPosted: Sun Dec 31, 2017 6:36 pm
it's been a couple years, Kurt, since my conversion, but I don't remember anything special about using old wires for our rain light. It's required on all our cars and I'd be surprised if it wasn't in the new harness. You are on you own for our red track sensor (can't remember it's name - it's New Years haha) in terms of wiring it into our master switch.
All the wiring for the Gen3 dash will include the rain light switch and rain map switch and its associated light. I would suggest you buy a couple more of those switch covers like on our main toggle switch for the rain map and pit limiting switches. Saves inadvertently hitting them in the heat of battle.
Mark Fick

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PostPosted: Mon Jan 01, 2018 6:20 pm
All the wires in new harness are there. Rain light,brake switch ect. Remove old harness. You do not need anything from that unless you are running the analog gauges on dash. You can reuse those wires if you are. If you are going with data like AIM it will all come from ECU and you do not have to have them.
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PostPosted: Mon Jan 01, 2018 6:32 pm
tonyrn99 wrote:All the wires in new harness are there. Rain light,brake switch ect. Remove old harness. You do not need anything from that unless you are running the analog gauges on dash. You can reuse those wires if you are. If you are going with data like AIM it will all come from ECU and you do not have to have them.

Thanks Tony. That’s exactly what I needed to know. I haven’t received the main harness yet, because it was back ordered. I won’t spend any time fooling with the old harness.
Kurt Breitinger
SEDIV #28
Chassis 494
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PostPosted: Tue Jan 02, 2018 3:44 pm
I think at least some of the early cars didn't have rain light wiring, some I've seen (including one last week) have a separate wire run outside the harness. The brake light wiring was in the harness...
Dave Harriman
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