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Grounding/wiring GS425

  • Thread starter Thread starter gspower
  • Start date Start date
http://www.cmsnl.com/suzuki-gs425-e-1979-usa_model16012/partslist/92081.html#results

This fiche is for the 79 E model. They are all most likely similar. Cable 7 in the Battery Schematic is the supply +ve to the solenoid. Cable 6 is the return to the battery -ve from either the crankcase or the frame. The starter motor has no ground cable as such and uses the crankcase as the first leg of the return path which is completed to the batt -ve with the cable.
Don't worry about the absence of the wire from the SPG in the schematic. As mentioned here already they had different quirky ideas about grounds back in those days.
 
Brendan W said:
http://www.cmsnl.com/suzuki-gs425-e-1979-usa_model16012/partslist/92081.html#results

This fiche is for the 79 E model. They are all most likely similar. Cable 7 in the Battery Schematic is the supply +ve to the solenoid. Cable 6 is the return to the battery -ve from either the crankcase or the frame. The starter motor has no ground cable as such and uses the crankcase as the first leg of the return path which is completed to the batt -ve with the cable.
Don't worry about the absence of the wire from the SPG in the schematic. As mentioned here already they had different quirky ideas about grounds back in those days.
Click to expand...

The frame ground was the problem. I mistakenly assumed that my one point ground on the shock-resistant (rubber mounted) airbox was enough of a ground. I ran another lead from -ve to the frame and it started right up.

Interestingly enough, there was a broken connector loop on the bolt that I grounded the battery to. It would seem that at one point in time the bike was grounded to the same spot. PO must have lost it or forgotten about it. When I purchased the bike I had a ton of electrical problems. This seems to be the problem. I checked with a cheap multimeter and at idle I am getting between 13.x and 14.x volts. At 5k rpm I am getting 14.x-15.x volts. After a quick ride and turning the bike off, battery read at 12.9v. Seems pretty good to me.

I have a lot of work to do before I can conduct further testing (painting parts, cleaning carburetors, ensuring there are no leaks in the airbox) before I take it out for a long spin but I am very happy with the results.

Brendan W, Posplayr ... thank you both SO much. I really appreciate the help.
 
Note all charging current from the R/R go out the red R/R(+) and have to return on the black R/R(-) so therefore the standard Single Point Ground (SPG) recommendation is:

SPG has three wires in:

  • Frame ground (16 ga or larger)
  • Battery Ground (16 ga or larger)
  • Harness Ground (stock is fine 18 ga or larger)

SPG has one wire out:

  • R/R(-) (14 ga or larger)

usually SPG is close to the R/R so that length is not longer than 12"

SPG is convenient on any mounting bolt on the side plate for side plate mounted R/R's.

It is really just that simple and has been described enough time, I don't know how to state it any simpler.
 
Last edited:
posplayr said:
Note all charging current from the R/R go out the red R/R(+) and have to return on the black R/R(-) so therefore the standard Single Point Ground (SPG) recommendation is:

SPG has three wires in:

  • Frame ground (16 ga or larger)
  • Battery Ground (16 ga or larger)
  • Harness Ground (stock is fine 18 ga or larger)

SPG has one wire out:

  • R/R(-) (14 ga or larger)

usually SPG is close to the R/R so that length is not longer than 12"

SPG is convenient on any mounting bolt on the side plate for side plate mounted R/R's.

It is really just that simple and has been described enough time, I don't know how to state it any simpler.
Click to expand...

As I stated, my SPG is on the sideplate under the solenoid. My R/R is grounded there, as well as my harness. It is then grounded to the battery, which is in turn grounded to the frame. I suppose I should also add an additional frame ground to the SPG so as to complete the circuit more easily, yeah? I am reading up on some material that you recommended - thank you for the suggestions.
 
gspower said:
As I stated, my SPG is on the sideplate under the solenoid. My R/R is grounded there, as well as my harness. It is then grounded to the battery, which is in turn grounded to the frame. I suppose I should also add an additional frame ground to the SPG so as to complete the circuit more easily, yeah? I am reading up on some material that you recommended - thank you for the suggestions.
Click to expand...


That one is not additional.....................
 
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