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Old 10-20-2000, 07:08 AM
stevebfl stevebfl is offline
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
The OVP (overvoltage protection) relay uses a Zener diode to act as a voltage regulator, spike suppressor. The diode allows current above a certain voltage to pass through the fuse to ground. Small spikes are just shunted larger ones blow the fuse.

The device is similar to a UPS (uninterruptable power source/whatever) for the car computors that are hooked to it.

The reason it causes so much problems (amongst those not familiar) is that the main system affected (KE-Jet) works rather well without electronic control. It looses all its enrichment schemes; most noticably cold start/warm-up enrichment.
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