The kits in question are not extra solenoids, just a small relay.
If weather conditions are a concern Jay's kit is designed for that.
I suggested Jay's kit because home job ones can fall short.

https://sites.google.com/site/vanagonheadlightrelays/hard-start-relays/hard-start-relay

Rather than the GW starter I use the VW TDI starter with Karl's kit.
That way you can get a replacement anywhere from a FLAPS when on the
road, now and 10 years from now. GW says you can't get theirs anywhere
but from them.

Mark

Stuart MacMillan wrote:
> You don't need to replace that wire unless there is something wrong with it,
> it just closes the relay with very little current and the relay switches the
> heavier load to the starter solenoid.
>
> I'm in the camp that doesn't believe in them. It's just another thing to go
> wrong, and if it isn't sealed properly it can short and activate the starter
> while driving down the road on a rainy day. That would not be good. My son's
> '87 had a kludged one installed and the starter was still intermittent, so
> it now has a GW gear reduction starter and no extra solenoid.
>
> Stuart
>
>