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Discussion Starter · #1 ·
Hey all,



I have had intermittent problems with my temp gauge going all the way to the red. I put an aftermarket gauge on it just to assure myself that it wasn't really getting hot - it wasn't. I just zip-tied the indicator part to the handlebars
, and I had to remove the heat shield below the coils, so I would like to get the original working again.



My question is, should I go through the wires to the regulator and look for a faulty ground, or just go ahead and order one from Marshall? If I order one from Marshall, is there a direct link like to an order form, or do I just email and request info?



Thanks,



Fib
 

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If you have a multimeter you can check the regulator and see if its working proprly. Pull the wire off the temp sensor in the therm housing and measure the voltage on this wire to a good ground. You should get 7V, if not check the ground for it. If the grounds look good, measure the voltage on the green ground for the reg, and if it is any higher than 0 then the reg is probabaly dieing.



There is a lot of info on this forum on how to make one, if not someone may have one they can sell you. Unfortunatly, Marshall passed away a little while ago which has saddened many as he was a great guy.
 

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Look for a faulty ground first.Grounds are solid green wires.This little rhyme will remind you"Green is mean on our machines".



Why have you removed the heat defector,"Spoiler"?



It's there for a reason.





Also check the bracket on the thermostat.The one that clamps to the thermostat housing MUST be grounded to the engine or your Temp gauge will go,"High".
 

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he one that clamps to the thermostat housing MUST be grounded to the engine or your Temp gauge will go,"High".



Sorry to be a pedantic SOB but it wont



A bad ground ( green) on the 7V regulator can make the output go high

as the reference voltage will 'float'

but poor grounding on the thermostat/sender will inhibit the current flow and make the

gauge read low, if at all.



Sadly, before we lost him. Marshall was providing kits for DIY 7V regulators

using the 7807 which for some reason is like rocking horse shit in the UK

Thats why I used cheap, common as muck, got loads right here, 7805s with

green leds on the ground pin to get the same effect.

Ok 6.95V but that'll do me its crude circuit anyway.



If you cant get a 7807, 7805's plus green leds and very important heatsink

will work nicely and have been for years.

7807 or 7805, Use a heatsink !



I'd say the occaisional peaking of Fibs gauge is down to the aformentioned bad

grounding or the gauge is breaking down.

Just cos it goes to a green wire doesnt mean its well grounded

you need further testing to know for sure.
 

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I may have got it the wrong way round Reg.I know if it's not grounded correctly it affects the gauge but it was over a year ago that I did your 7v Regulator and I forgot secure that bracket after I had been messing around.
 

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Discussion Starter · #6 ·
Thanks for the input guys. Sorry about mentioning Marshall. I never had the pleasure of hearing from him here, but I feel that he was part of the family and his loss saddens me as well.



Shep, I removed the heat shield because the aftermarket gauge I put on uses a copper line that would have crimped if I had left it in place. That is just part of the reason I really want to fix my original gauge.



I did check the wire that goes to the sending unit and it was showing 11+v. I have not yet traced the wires to see if I have grounded out somewhere else. Where would the regulator be on my GL? I opened up the panel behind the fairing but I didn't see it there; maybe I just missed it though.



Thanks again.



Fib
 
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