Originally Posted by Hightower
Thanks for your help Dave. Couldn't really justify spending £60 for a pair of relays so had a hunt around and bought a pair for under a £5er.
The only difference I can see is a resistor across the coil on the original relays is missing from the cheaper ones. Something to do with EMF or something.
Sheesh! Glad you got sorted though. A fiver sounds a lot better. The resistor across the coil is to reduce the back EMF when the coil is switched off, it reduces the arcing across the tilt switch contacts. It could be a resistor or a diode, various methods are used, but they all have the same result. Not having one might
mean the trim switch contacts burn/wear faster, but I doubt it. What you might get is a crackle on the radio when you operate the trim, due to the extra arcing, but for 55 quid you could put up with it. The other solution is to cross match the ones on the old relays & solder some across the coils on the new ones, pennies from Maplins.