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Re: Sabatoged ??? Found relay in G/Box no start wth..? Posted by Larry West [Email] ![]() ![]() ![]() In Reply to: Sabatoged ??? Found relay in G/Box no start wth..?, Erick, Thu, 4 Oct 2012 04:11:23 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Three-prongs doesn't sound like a relay. It could be a flasher "relay", but I don't think from a Saab, and certainly not a 900.
The only other thing I can think of in a 900 that might have only three prongs and look like a relay is the "inverter" that was used very briefly in either 1988 or 1989 or perhaps both. It was needed on the Shift Up warning light because of a redesign of the dash for LH 2.4, while the turbos were still using LH 2.2.
In LH 2.2, Shift Up was a separate system, completely unrelated to the LH. In LH 2.4, Shift Up was incorporated into LH, and it turns the light on by calculating engine load and RPMs against road speed. The old system sent +12 to the bulb, the LH 2.4 grounded the bulb. The "inverter" uses a transistor to make a late dash work with the early shift up system. The inverter carries a printed or molded symbol that looks like a transistor (circle with three "leads" going into it) on the side.
As for the other "loose" wires, there are a few wires that never seem to get any connection to them under the dash. For the most part, they should be left alone, unless one is positive that it should be going someplace. Any relay that has anything to do with the FI system or Ignition will be in some kind of relay panel securely attached to the chassis.
_______________________________________ Current: 2002 9-5 Aero Kombi Cosmic Blue 2000 9-5 SE sedan, Imola Red 1990 900S Rose Quartz, Auto Past: 1999 9-5 LPT Combi 1999 9-5 LPT sedan 2002 9-5 Arc 1990 900 5-speed 1986 900 turbo Convertible 1991 9000 turbo 1980 99 GLi 1986 900 turbo 1986 900 S 1991 900 turbo 1984 900 turbo 1976 99 GL
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