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Alex1976

Member Since: 23 Jan 2013
Location: Buckingham
Posts: 596

Wiper fuse keeps blowing - help!

Hi all,

My 300tdi 90 is blowing the front wiper fuse and I am struggling to find the reason why.

I thought it was a park switch issue so I bought a new one and fitted it only to find it makes no difference.

The wipers work fine if I disconnect the relay, but it means I have no wiper park function or intermittent wipe.

If I take the park switch off its mounting on the wiper motor, but leave the wires connected it works the same as when the relay is disconnected.

As soon as I push in the plunger on the park switch the fuse blows.

Any ideas please?

8th Nov 2015 10:09am

dorsetsmith

Member Since: 30 Oct 2011
Location: South West
Posts: 4554

Can you turn the motor by hand ? is it free to move

with motor assembly disconnected wiper drive can you mover the wiper arms ? are they free to move

disconnect plug too the motor assembly see if fuse holds

if all of above ok you my have short cct in motor assembly

The fuse is blowing du excess current or short cct wiring

my apologies i should try reading it properly

Edit i may be the AMR 2341 i.e. relay has failed

try a new AMR 2341 relay

Last edited by dorsetsmith on 8th Nov 2015 1:37pm. Edited 1 time in total

8th Nov 2015 11:07am

Alex1976

Member Since: 23 Jan 2013
Location: Buckingham
Posts: 596

Ok tried a known good relay and this makes no difference.

If I disconnect the plug to the motor assembly the fuse holds.

So is it looking like I need a new motor?

Thanks for the help! Much appreciated

8th Nov 2015 11:56am

mk1collector

Member Since: 17 Sep 2009
Location: West Yorkshire
Posts: 6769

Wiper boxes can seize and cause the none moving motor to blow the fuse. Ray
My build thread
http://www.defender2.net/forum/topic17615.html

8th Nov 2015 12:55pm

dorsetsmith

Member Since: 30 Oct 2011
Location: South West
Posts: 4554

The wipers work fine if I disconnect the relay,

but it means I have no wiper park function or intermittent wipe.

8th Nov 2015 1:07pm

Alex1976

Member Since: 23 Jan 2013
Location: Buckingham
Posts: 596

The wipers are definitely not seized. When they are working they sweep very smoothly and easily and cover the area you would expect.

This Apis really stumping me. I am thinking I need to try a new motor, but trying to avoid playing parts roulette.

8th Nov 2015 9:57pm

Alex1976

Member Since: 23 Jan 2013
Location: Buckingham
Posts: 596

I have ordered a new motor that should be here tomorrow, so I can see if that makes any difference.

In the mean time I have been trying to see if I can work out what is going on. I fitted a bulb in place of the 10 amp fuse today to see what happened.

The wipers work, but as soon as the plunger on the park switch is depressed the bulb lights up nice and bright until the button is released again. I take it the bulb should not be lighting up as it is this current that is blowing the fuse?

I would like to think the new motor will fix it tomorrow, but I am not very confident it will

12th Nov 2015 3:56pm

dorsetsmith

Member Since: 30 Oct 2011
Location: South West
Posts: 4554

Click image to enlarge

wiring diagram may help

12th Nov 2015 6:10pm

Alex1976

Member Since: 23 Jan 2013
Location: Buckingham
Posts: 596

OK tried a brand new TRW Lucas motor and exactly the same symtoms happen!

So I seem to have got it down to there is a fault in the park switch circuit (not the switch itself as I have tried others).

Thanks for the wiring diagram DorsetSmith. Can anyone guide me as to what wires should be live etc when the park switch plunger is activated? At the moment as soon as the parking switch is activated the wipers stop but the fuse blows - so clearly there is a large current being passed through the main green wire that runs through the 10 amp fuse for some reason. I thought that with the parking switch activated I shouldn't see any power on any contacts.

Thanks for all your help

13th Nov 2015 1:44pm

Alex1976

Member Since: 23 Jan 2013
Location: Buckingham
Posts: 596

I tried a new wiper stalk switch today and this has improved things, but still not right.

The new switch now works properly in that it makes the wipers park, however they now park in the upright position! I think I can fix this by moving the cam in the wiper motor, but still not sure how they can get in the 'wrong' place.

I still have now wash/wipe function. If I push the button on the end then I get wash but no wipers.

Both speeds of continous wiper work but no intermittent still.

So I presume there is a wiring issue as I have tried every component (as far as I know) relay, motor, wiper stalk switch.

18th Nov 2015 2:21pm

Alex1976

Member Since: 23 Jan 2013
Location: Buckingham
Posts: 596

Just thought I would update on how I fixed this as reference for others who may be looking for a solution to a similar problem.

Now got the wipers fully working today, after stripping the motor and changing the cam on the wheel so it parks the wipers in the correct place. Also found a loose wire on the back of the wiper stalk. But most annoyingly I found out that the brand new bearmach relay I had bought was duff, so with a new one in it all works fine.

28th Nov 2015 9:18pm

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