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1986 911 Turbo - black/red relays

Fooling with a no spark problem.
I lost track of where the red and black relays go on the main fuse panel.
Anybody got a picture?
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1986 911 turbo - less than 30k miles
Old 10-15-2017, 03:23 PM
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
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Old 10-15-2017, 05:27 PM
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Just for the two fuel pumps?
Hmmm, mine must have multiplied

Thanks!
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1986 911 turbo - less than 30k miles
Old 10-15-2017, 08:45 PM
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The red relays have a flyback diode installed across the relay coil to prevent a voltage spike when the coil is de-energized.
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1977 930 Slant, MS3 EFI, Carrera intake, Twin plug, Powerhaus headers, Magnaflow muffler, Garretson intercooler, GTX3071R
Old 10-16-2017, 06:48 AM
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Quote:
Originally Posted by dap930 View Post
The red relays have a flyback diode installed across the relay coil to prevent a voltage spike when the coil is de-energized.
In other words, counter EMF as the magnetic field around the coil collapses and induces a voltage spike, which in turn can arc across the relay points and shorten their life. The spike still happens, but can't get past the diode. Layman's terms for what very little I know about electricity.

Or am I confusing this with capacitors in old-style points ignition where a person had to set the gap and thus the dwell? Showing my age and fuzzy memory once again, so never mind!
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Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, stock everything else. The result of a massive Pelicanite good will fire recovery effort. Truely an open book, ready for the slippery slopes to modification.
Old 10-16-2017, 06:07 PM
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