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300sd plug relay clicking loudly on left indicate - and heating fuse.

Started by isobars, 04 August 2024, 08:28 AM

isobars

Hi Everyone,

My '79 hasn't had a glow light for years, but give it a 20 second wait and all is well and an easy start.

I've recently had some wiring problems with the front left indicator and headlight so they are temporarily disconnected.

Today when I indicated left for the benefit of following traffic, the plug relay, (0015457832), started to click really loudly.

The 80A fuse was very hot to the touch.

(Where I am located, headlights are only compulsory at night and hand signals are permitted).

If I pull the indicator fuse, the noise stops and the car starts, no problem.

Any advice gratefully received.

Cheers,

Paul




blushingcobbler

Quote from: isobars on 04 August 2024, 08:28 AMHi Everyone,

My '79 hasn't had a glow light for years, but give it a 20 second wait and all is well and an easy start.

I've recently had some wiring problems with the front left indicator and headlight so they are temporarily disconnected.

Today when I indicated left for the benefit of following traffic, the plug relay, (0015457832), started to click really loudly.

The 80A fuse was very hot to the touch.

(Where I am located, headlights are only compulsory at night and hand signals are permitted).

If I pull the indicator fuse, the noise stops and the car starts, no problem.

Any advice gratefully received.

Cheers,

Paul




Since you've had issues with the front left indicator and headlight, it's possible that there's a short circuit or crossed wires. The clicking relay and the heating fuse might be symptoms of a short circuit, which could cause excessive current draw.
The relay might be faulty, particularly if it's clicking loudly. A malfunctioning relay can draw more current than necessary, causing the fuse to heat up.
The glow plug relay and the indicator wiring might share a common ground or power supply path. Any issues in these connections could affect both systems.
If the 80A fuse is getting hot, it suggests that there is a significant current draw, which might be due to an overloaded circuit.
Ensure that the relay and fuse you are using are the correct specifications for your vehicle. An incorrect fuse rating or relay could cause overheating and malfunction.
Until the issue is resolved, avoid using the left indicator to prevent further damage or overheating. Rely on hand signals as allowed by local regulations.