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Radio Suppression Relay Plug 900 1994

1994 940 NA sedan. While I have preventatively replaced my Radio Suppression Relay, on another board I have heard that the plug that inserts into this relay is also a failure point. Does anybody have experience with this? I note that Dave Barton Volvo sell these plugs:

https://www.prancingmoose.com/blackvinyl.html#pigtailfemale

While I am okay with replacing things like relays, I really am raising my eyebrows at the idea of changing what appears to be good condition wiring harness parts, especially for a car that has always been kept in a rodent free garage. Still, that is better than being stranded.

Anybody have these plugs fail? Anybody recommend such a practice?

Thanks!








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    Radio Suppression Relay Plug 900 1994

    I did have a problem with that plug on my 945T after around 350K miles. Almost got stuck but pushed it together and was able to get home. Then replaced the plug connectors.

    A lot of current is going through the plug which generates heat and breaks things down. Always good to be prepared.








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    Radio Suppression Relay Plug 900 1994

    I have had five 7/9 series cars over the years. I have only had one issue with the plug/connector on the RSR (on an 88 740)and that was a bit of corrosion on one of female spades. A quick clean up solved the problem.

    I wouldn't worry about the connector failing and stranding you as I think the chances of that are extremely slim. I would be more concerned about a cracked solder joint in the relay letting you down. Carry a spare along with a fuel injection relay and eliminate the worry.

    Trouble shooting a failure to run that might be associated with the radio suppression relay is a simple task. Just remove the relay and use two pieces of wire to jumper across the plug. Use the two jumpers to directly connect the four heavier gauge wires. Just be sure you are connecting wires of the same color code.
    --
    Any twenty minute job is just a broken bolt away from a three day ordeal








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    Radio Suppression Relay Plug 900 1994

    Dear U.S. Diver,

    Hope you're well and stay so! Wiring harness connectors do fail, but that's usually the result of force being over-applied to old and so embrittled plastic, when separating a connector from, say, a relay.

    If corrosion bonds a connector's metal terminals to a relay's terminals, using force to separate them can break the plastic connector housing. Rather than trying to pry apart a "bonded" item, it is best to apply a corrosion-dissolving aerosol, e.g., Deoxit, and allow it time to work.

    Much as do penetrating oils (e.g., PB Blaster, Kroil) when applied to rusted nuts or bolts, corrosion-dissolving aerosols penetrate micro-channels in the corrosion that bonds electrical items. This may take some time. Those, who try to "speed-up" the process by using force, can do damage.

    To reduce the risk of corrosion-bonding on electrical connectors, separate them after applying an anti-corrosion aerosol and giving it time to work. Then apply a thin coating of di-electric grease to the metal contacts. This will keep humidity from reaching and corroding the metal.

    Hope this helps.

    Yours faithfully,

    Spook







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