Gazzar Posted July 31, 2018 Share Posted July 31, 2018 I think the voltage stabilizer is failing on the 109, the temp and fuel gauge are both under reading. What's the most reliable replacement? Genuine or solid state? G. Quote Link to comment Share on other sites More sharing options...
xychix Posted July 31, 2018 Share Posted July 31, 2018 Solid state would be a relais... don't think that would do any good (unless you have it pulse at a high speed to is spits out.... 10??? volts). What is the spec on that? An adjustable output voltage regulator would be my approach. Set it to the correct voltage (believe it was 10v) and seal it... example https://www.banggood.com/DC-DC-Boost-Buck-Adjustable-Step-Up-Step-Down-Automatic-Converter-XL6009-Module-p-1087346.html?rmmds=search&cur_warehouse=CN Something based on LM7810 would also be good enough if the max draw is ~1.5A (preferrably draw WAY less as the leftover is dispensated as heat). example: https://www.ebay.com/p/10v-DC-Voltage-Regulator-Module-Board-Based-on-7810/918099164?iid=191225808693 Quote Link to comment Share on other sites More sharing options...
xychix Posted July 31, 2018 Share Posted July 31, 2018 Can you do a bench check on this stabilizer? isn't is just a rotten ground wire with some resistance? Quote Link to comment Share on other sites More sharing options...
Gazzar Posted July 31, 2018 Author Share Posted July 31, 2018 It's an analogue device, bi metallic strip. Multi metres struggle to cope. I will check the earth, it earths against the instrument casing, so I'll check all of that. Thanks. Quote Link to comment Share on other sites More sharing options...
Bigj66 Posted July 31, 2018 Share Posted July 31, 2018 3 hours ago, Gazzar said: It's an analogue device, bi metallic strip. Multi metres struggle to cope. I will check the earth, it earths against the instrument casing, so I'll check all of that. Thanks. Old Fords have the same issue. One fix is to run a separate earth from the binnacle to a known good earth point. Quote Link to comment Share on other sites More sharing options...
lo-fi Posted July 31, 2018 Share Posted July 31, 2018 Solid state all the way. I've got one I believe I got from ebay, its been great. Its just a low dropout voltage reg in a nice little potted box with three wires coming out. Quote Link to comment Share on other sites More sharing options...
lo-fi Posted July 31, 2018 Share Posted July 31, 2018 Similar to this: https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F253756291467 Quote Link to comment Share on other sites More sharing options...
Jon White Posted July 31, 2018 Share Posted July 31, 2018 Just use a 7810 regulator. Cost pennies and will use the screw the old unit used to mount and use the speedo as a heat sink. I’ve had one for years. Just solder leads on and away you go. Quote Link to comment Share on other sites More sharing options...
Peaklander Posted July 31, 2018 Share Posted July 31, 2018 ^^^ this. I did the same on my 88 and even put the regulator in the little box that the original one was in. Quote Link to comment Share on other sites More sharing options...
Gazzar Posted August 1, 2018 Author Share Posted August 1, 2018 16 hours ago, lo-fi said: Similar to this: https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F253756291467 That looks easy. I think I'll try that first. Thanks. G. Quote Link to comment Share on other sites More sharing options...
xychix Posted August 1, 2018 Share Posted August 1, 2018 The one from Lo-fi is likely a 7810 + 2 elco's. the fixation point IS the ground so make sure it is mounted to a proper ground! Preferrably a ground that will also displace some heat. Quote Link to comment Share on other sites More sharing options...
xychix Posted August 1, 2018 Share Posted August 1, 2018 Would need 2 elco's (consensators... if that is proper english) before and after is to flatten out ripples and a good mounting point with some cooling (alu + ground would be fine) Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted August 1, 2018 Share Posted August 1, 2018 xychix - I think you mean electrolytic capacitors? The gauges don't need it, they react so slowly as the original regulator works by switching the voltage on/off every second or two (very slow). 1 Quote Link to comment Share on other sites More sharing options...
Peaklander Posted August 1, 2018 Share Posted August 1, 2018 ^^^^^ i knew that the original switches the 12 volts or whatever the alternator delivers at any point but I'd always assumed the switched is much quicker. The output is a nominal 10V but I don't know how to work out what the "chop" frequency would need to be. (I might have known this at a point in the past but I've forgotten now). Is it really only 1Hz or less - just for interest? Quote Link to comment Share on other sites More sharing options...
xychix Posted August 1, 2018 Share Posted August 1, 2018 20 minutes ago, FridgeFreezer said: xychix - I think you mean electrolytic capacitors? The gauges don't need it, they react so slowly as the original regulator works by switching the voltage on/off every second or two (very slow). in that case I'd go for a LM7810 for sure. some soldering, hotglue and a tape around the legs. piece of copper as heatsink to the back and mount to firewall Quote Link to comment Share on other sites More sharing options...
Anderzander Posted May 29, 2019 Share Posted May 29, 2019 On 8/1/2018 at 10:42 AM, Gazzar said: That looks easy. I think I'll try that first. Thanks. G. What did you use Gazzar? Quote Link to comment Share on other sites More sharing options...
Gazzar Posted May 30, 2019 Author Share Posted May 30, 2019 It's strange. I think the regulator is working better now. It's underreading, but not nearly as much as before. I've been doing more miles recently, off and on road, and I think that might help. I'm going to change it anyway, but not until I get time. So, that will be when I retire, I suppose. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted May 30, 2019 Share Posted May 30, 2019 A whole £2 gets you a waaaay over-rated adjustable regulator that will likely fit inside the old casing: https://www.ebay.co.uk/itm/361535175546 Many similar units all over eblag / alibaba etc. Quote Link to comment Share on other sites More sharing options...
Gazzar Posted May 30, 2019 Author Share Posted May 30, 2019 No doubt. Won't get the time I need, though. Too much to do! Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.