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110Matty

Member Since: 20 Apr 2023
Location: Somerset
Posts: 104

Relay wiring

Hello.

I’m wiring up heated seats (aftermarket Mazda RX8 fitted by a PO). I’m using OE dash switches and am using relays. I have 2 questions that I keep going round in circles over.
1. Do I need a fuse between output pin 87 before accessory in addition to battery to pin 30 fuse?
2. Are OE switches switched negative or positive and does it make a difference if I switch into pin 86 with 85 ground, or round the other way?

Many thanks,

Matt.

7th Apr 2024 6:24pm

PaulMc

Member Since: 17 Jan 2009
Location: Kent
Posts: 488

Both Puma and TD5 heated seat switches are positive switching between pin 1 and pin 4 - and, yes, it does make a difference, because the background and tell-tale illumination are LEDs, which are polarity sensitive.

You only need a fuse on the supply to relay pin 30

Click image to enlarge

. Paul.
1989 Arles Blue 2.5TD 110 Hardtop
1999 Epsom Green Discovery II 4.0 V8i 'XS'

7th Apr 2024 8:39pm

110Matty

Member Since: 20 Apr 2023
Location: Somerset
Posts: 104

Brilliant, thank you @paulMc 👍

7th Apr 2024 9:16pm

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