One of ours used to have water running down the antenna wire and drip
right into that relay which was upside down. One reason I got it so
cheap was it wouldn't run in the rain and no mechanic could figure it
out.

I also have had issues on several of them with the fuel pump fuse. The
heat takes the temper out of the fuse holder so it doesn't hold the fuse
tight. The test for that is to see if the fuse is physically hot. If
so, a good clean and bend of the contact is in order.

That said why not just replace the relay, they are something like ten
bucks. You also can pop off the cover to see if the contact points
inside are arced out.

A normal Bosch relay's pin out is pin 30 and 87 for the main power with
pin 85 and 86 as the trigger. My old 240's used this number system and
bosch relays.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

wrote:
>
> OK.... it's an intermittent fault so the mechanic will NEVER find it. I
> of course suspect the main relay (replaced once, like 10 years ago).
> So... thought I'd wire in a switch across the terminals which I could
> use to bypass it when it is being uncooperative, and either prove or
> disprove the relay theory. And make the car run, if I am right. But I
> can't find my Volvo wiring manual. So... which terminals would be
> appropriate to bypass/jump?
> Thanks.