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Maverik

PRC4427 Voltage Sensitive switch

6 posts in this topic

Another mystery to me while stripping the 89, LR110.

There was the big yellow relay PRC4427 floating around behind the dials when I took it apart, there are a lot of fine brown/black wires going into the relay base.

Can anyone tell me what the relay was for?

I thought you only needed them in a split charge system, said vehicle has only one set of battery cables and no other signs of a split charge system...

Mav

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Often also used for rear window demisting so it's only on when the engine is running and battery is not low.

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as above it's to stop the rear screen heater being switched on & draining the battery when engine is of & alternator is not charging, if you look in the right corner there should be a metal tab for the VSS to fit on to, it's sits next to the rear screen heater relay.

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Sometimes also used (as an alternative to a timer on the principle that "I've got this so I don't need to buy a timer") when retro-fitting a heated windscreen and/or heated mirrors.

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& it's also used on some models with lights above the screen as a can't be switched on if engine is not running. to protect the battery from being flattened

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Thanks guys, I think this might have solved the mystery of some empty relay holders on the 110 too...

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