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relay wiring
beaver34 - 5/8/13 at 07:16 PM

hi,

can someone clarify the wiring for a fuel pump relay as i think im going mad.

i have power from battery to fused no 30

85 to earth, 86 from on switch other side is from fuse box and 87 to the pos on the pump

nothing happens

its just a normal 30amp 4 blade relay as far as im aware, i purchased two one for each pump i run and neither are working

thanks

Daddylonglegs - 5/8/13 at 07:50 PM

Sounds OK wiring wise, if you have a multimeter check across 30-87 fro continuity when you energise the coil. If that works, try connecting 30 directly to 87 and see if the pump runs. If not then at least you can trace it from there.

HTH

beaver34 - 5/8/13 at 08:56 PM

quote:
Originally posted by Daddylonglegs
Sounds OK wiring wise, if you have a multimeter check across 30-87 fro continuity when you energise the coil. If that works, try connecting 30 directly to 87 and see if the pump runs. If not then at least you can trace it from there.

HTH


fixed, swapped 86 and 87 working fine on both now

omega 24 v6 - 6/8/13 at 09:27 AM

Mmmm your originl explanation sounded fine. If swapping 86 and 87 solves the problem then 2 things spring to mind. Either your original explanation is NOT how you wired it OR you have ( there are 2 types A and B IIRC) an odd relay where the pin configurations are NOT a std layout.
You have to watch out for these when plugging into a std wired car relay socket .

beaver34 - 6/8/13 at 09:38 AM

quote:
Originally posted by omega 24 v6
Mmmm your originl explanation sounded fine. If swapping 86 and 87 solves the problem then 2 things spring to mind. Either your original explanation is NOT how you wired it OR you have ( there are 2 types A and B IIRC) an odd relay where the pin configurations are NOT a std layout.
You have to watch out for these when plugging into a std wired car relay socket .


id been at work 12 hours before so its more than likley i confused myself somewhere along the wiring

Daddylonglegs - 6/8/13 at 09:57 AM

I'm with Gary on that one, still at least you got it sorted

big-vee-twin - 6/8/13 at 03:30 PM

Some relays have a diode across the coil therefore making them polarised