The 70's called and I answered. 1975 GL1000 project

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ericheath
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Re: The 70's called and I answered. 1975 GL1000 project

Post #46 by ericheath » Thu Feb 13, 2020 1:19 pm

Looks like it has electronic ignition with the red wire to the flasher. Most of us find a wire that is hot all the time the ignition is on and solder in a fused line. Yours is the way Dyna recommends, but if you lose a turn signal, you lose your ignition. Another upgrade is to use a relay to trigger a direct hot 12v wire to power the ignition. Old bikes, old corroded connections result in voltage losses that can affect performance, and these bikes have several connectors from the battery up to the fuses to ignition switch to ........... lots of places to drop voltage.
Whatever I suggest here should be given ample time for a moderator to delicately correct. I apologize in advance.
77 WING, 1200 engine with 77 heads, cams, gl1100 foot pegs, Magna V65 front end, 764A carbs, [-gone Suzuki M109 monoshock--, replaced with gl1100 shocks] gl 1200 swing arm, gl1500 final drive, wheel and rear brakes Valkyrie seat, Meanstreak tank, Sportster pipes, Power Arc ignition off crank.
77 Wing. black
83 Wing, in pieces
"Continuing education is important even if the subject matter is fairly useless (as in this case)."---Greg Foresi

old_smokey
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Re: The 70's called and I answered. 1975 GL1000 project

Post #47 by old_smokey » Thu Feb 13, 2020 2:02 pm

Right you are - I installed as per the Dyna instructions, with that terrible clamping fitting. It was just to try and squeak a ride in before the snow falls. I'll follow your suggestion and tap into a keyed hot line. off hand do you know what size fuse the ignition would require? I like that idea of a relay direct to the ignition. Clean and simple.


Regarding the earlier comment about the hanging idle - that issue actually went away pretty much. It was happening when I had the stock points and the advance mechanism was getting stuck. I removed it, cleaned and lubed, and installed a Dyna ignition, now it's much better.

Carbs are almost good as-is, just one of the o-rings around a main jet was ripped in half when I rebuilt them in summer. I put it back in best I could in the fall, and marked it down as "replace in winter". I think it's worth getting an entire rebuild kit of seals and gaskets and replacing them all to be safe.
1975 GL1000
1974 CB350F
1974 CB750K
1978 CB750K
1977 XT500D
1982 XL125S
1985 R80
2001 XR650L

old_smokey
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Re: The 70's called and I answered. 1975 GL1000 project

Post #48 by old_smokey » Fri Feb 14, 2020 11:07 am

Success last night. I got both gauges working.

First I removed the seat to inspect the fuel sender. Ah ha...there's the problem. One of the sender wires is disconnected! I cleaned both connectors and reattached. Still no activity on the gauge though. hmm...

Checked for good power and ground, and had both at the harness. Measured resistance of the sender and it registered around 80ohms. That's standard for an empty tank.

Wait a second...empty tank....haha!! Popped the fuel cap open and sure enough, the tank was nearly completely empty. So I moved the float up and down by hand and sure enough the fuel gauge responded. The needle moves quite slow, but I hear that's pretty typical.


Next up, temp gauge. I tested 7V at the gauge, and decided to trace the wire down to the sender. WOW is that sender in an inconvenient location. I was able to pull the connector off with some very long pliers, and found it was heavily corroded and green. Ah hah! Gave the connection a thorough cleaning, then grounded it out with the key on. Eureka! The temp gauge slowly climbed to max.


One thing I want to confirm - does the temp gauge have any way of turning on the fan? Or is that entirely controlled by the fan switch? The fan never turned on when the gauge climbed, but if I'm looking at this correctly, they are independent circuits.
1975 GL1000
1974 CB350F
1974 CB750K
1978 CB750K
1977 XT500D
1982 XL125S
1985 R80
2001 XR650L

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CYBORG
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Re: The 70's called and I answered. 1975 GL1000 project

Post #49 by CYBORG » Fri Feb 14, 2020 11:13 am

The gauge has nothing to do with turning on the fan. It is controlled by a separate temp switch
1978 custom GL1000
1977 custom with 1200 engine
1985 gl1200

old_smokey
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Re: The 70's called and I answered. 1975 GL1000 project

Post #50 by old_smokey » Fri Feb 14, 2020 11:38 am

Excellent. Then everything electrical is now working as intended. My key switch is a bit sticky, so I'll need to clean that out. But otherwise I think it's on to forks tires and brakes.
1975 GL1000
1974 CB350F
1974 CB750K
1978 CB750K
1977 XT500D
1982 XL125S
1985 R80
2001 XR650L

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pidjones
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Re: The 70's called and I answered. 1975 GL1000 project

Post #51 by pidjones » Fri Feb 14, 2020 3:33 pm

The 3 meters are bimetallic and only respond as they heat, so very slow - but prevents the fuel gauge from bouncing. Keeping connectors clean is an ongoing maintenance item.
"Love 'em all.... let God sort 'em out!"
1978 GL1000 - winter project for 2020 challenge
2006 GL1800 - the Black Pearl
1979 GL1000 project - to be restored
1978 GL1000 with '75 engine - the Hunley
Ex '79 CB750F rat bike - the Rocket - SOLD!
Ex '86 SEi
Ex '77 GL1000
Ex '75 RD400
Ex '72 Penton 125 set up for flat track
Ex '73 RD250
Ex '68 TR6C - chopped


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