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| Formula - best place to find ignition 12v in engine bay or trunk? (Page 1/2) |
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rbell2915
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JUL 27, 07:57 PM
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See title. I am working on a digital cruise install and need an ignition 12v source. Thanks!
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olejoedad
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JUL 28, 06:15 AM
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Blue wire on backup light switch.
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Vintage-Nut
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JUL 28, 08:46 AM
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Another ignition 12V+ source in the engine bay is the Fuel Pump Relay
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Original Owner of a Silver '88 GT
Under 'Production Refurbishment' @ 136k Miles
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rbell2915
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JUL 28, 08:58 AM
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Thank you. I was looking at one digital cruise install guide and realized it was specific to 86-87 fastbacks and now I'm going in a different direction but this will still be helpful, I just need to follow a different guide.
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Raydar
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JUL 28, 09:58 AM
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| quote | Originally posted by Vintage-Nut:
Another ignition 12V+ source in the engine bay is the Fuel Pump Relay
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Are you sure that's "ignition" and not "battery"?
The fuel pump fuse is connected straight to battery.
(Not arguing. Serious question.)
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Raydar
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JUL 28, 10:00 AM
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olejoedad
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JUL 28, 01:03 PM
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| quote | Originally posted by Vintage-Nut:
Another ignition 12V+ source in the engine bay is the Fuel Pump Relay
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The fuel pump relay has 12v BAT on the orange/black wire and the green/white wire sees 12V IGN from the ECU.
***I would NOT use the ECU 12V signal to power the digital cruise.***
***The easiest and best protected 12V IGN source is the DARK BLUE wire going to the NSS (auto trans) or the BACKUP LIGHT SWITCH (manual trans).***
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Dennis LaGrua
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JUL 28, 02:27 PM
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Some good info here but I believe the 12V connection will depend on how much amperage you wish to draw. For high demand items like an MSD ignition box I just set up a terminal junction box off the positive battery lead and use an inline fuse. To do this the battery terminal was changed to one that allowed attaching feed wires. . The terminal box is mounted on the rear firewall. ------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "
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rbell2915
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JUL 28, 03:07 PM
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| quote | Originally posted by olejoedad:
The fuel pump relay has 12v BAT on the orange/black wire and the green/white wire sees 12V IGN from the ECU.
***I would NOT use the ECU 12V signal to power the digital cruise.***
***The easiest and best protected 12V IGN source is the DARK BLUE wire going to the NSS (auto trans) or the BACKUP LIGHT SWITCH (manual trans).*** |
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I'll use the switch off the trans since it's right there, thank you.
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fieroguru
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JUL 28, 07:13 PM
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As Joe mentioned, the reverse light power feed is a good choice as it is rarely in use, and would not be needed when the cruise would be drawing power.
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