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Model specific boards => Golf mk3 => Topic started by: boneybradley on 28 February 2013, 15:54

Title: fuse keeps blowing on heated rear screen... what to check?
Post by: boneybradley on 28 February 2013, 15:54

Well I have a small issue with my heated rear screen, it keeps blowing the fuse. I have changed the switch for one I know is fine and checked the wiring (as much as possible)

Are there any other things to check?

I am guessing the earth but I don't know where that is located, and what do i need to check, also it's possible i have a faulty heated mirror which i guess would cause the same fuse blow as they share the circuit?

any advice welcomed

Title: Re: fuse keeps blowing on heated rear screen... what to check?
Post by: WeekendMechanic on 28 February 2013, 17:38

Did you check the wires in the rubber bellow, could be touching to an earth wire causing the short circuit....

Title: Re: fuse keeps blowing on heated rear screen... what to check?
Post by: javalin on 01 March 2013, 10:59

check the resitance across the heating element, then you can calculate the load (amps) and that might explain the blowing fuses.  Does it blow instantly when turned on, or after a while?

Title: Re: fuse keeps blowing on heated rear screen... what to check?
Post by: boneybradley on 01 March 2013, 11:40

Quote from: javalin on 01 March 2013, 10:59

check the resitance across the heating element, then you can calculate the load (amps) and that might explain the blowing fuses.  Does it blow instantly when turned on, or after a while?

it's hard to say, I think it blows with the ignition? (It was fine until i restarted the engine... I think?)

I will check resitance this weekend, I am also going to unplus it and see if the mirrors blow it?

Title: Re: fuse keeps blowing on heated rear screen... what to check?
Post by: javalin on 01 March 2013, 11:50

yeah check anything else on that fuse too.

Title: Re: fuse keeps blowing on heated rear screen... what to check?
Post by: Bellend on 01 March 2013, 12:41

Does it blow with switch off and ignition on?

Title: Re: fuse keeps blowing on heated rear screen... what to check?
Post by: boneybradley on 01 March 2013, 15:28

Quote from: Bellend on 01 March 2013, 12:41

Does it blow with switch off and ignition on?

I will check that when I get some new fuses this weekend! i think it's only when the switch is turned on and ignition is initially turned on (it seems to be fine other times?)