75 GT550 M - LH Side Turn Signal Puzzle
Posted: Sat Oct 14, 2017 11:06 pm
I have a small problem which I cannot seem to find the cause. I fitted the battery in my 75 GT550 a week ago after a full restoration. The turn signal relay is the original Nippon Denso (JFK-0080, 23w x 2 x 1.7w. 12.8v) and everything on the bike electrically works fine apart from a problem with the LH side turn signals;
Ignition on and engine run switch OFF, both RH turn signals flash on/off and as well as the indicator light, however when you switch to the LH side, only the front LH signal comes on as well as the indicator light, however there is no flashing at all.
Alternatively:
Ignition on and engine run switch ON, both RH turn signals and indicator light come on but do not flash at all. When you switch to the LH side again the LH signal comes on as well as the indicator light - there is no flashing.
I have checked all of the wiring hardness connectors with my meter and all of the colour connectors match up. I also checked all the bulbs, earth leads and turn signal earth points and everything is in order. I then found an old signal relay from a 72 Suz T500 which seemed to be exactly the same relay as the GT550. I wired this up and got the following results:
Ignition switch on and engine run switch in either the ON and/or OFF position, both RH turn signals flash on/off and as well as the indicator light, however when you switch to the LH side, again only the front LH signal comes on as well as the indicator light - there is no flashing.
Could the signal relay be causing this problem? Maybe both the GT550 and old T500 replays are faulty. Any ideas on how to fix this problem would greatly be appreciated.
Ignition on and engine run switch OFF, both RH turn signals flash on/off and as well as the indicator light, however when you switch to the LH side, only the front LH signal comes on as well as the indicator light, however there is no flashing at all.
Alternatively:
Ignition on and engine run switch ON, both RH turn signals and indicator light come on but do not flash at all. When you switch to the LH side again the LH signal comes on as well as the indicator light - there is no flashing.
I have checked all of the wiring hardness connectors with my meter and all of the colour connectors match up. I also checked all the bulbs, earth leads and turn signal earth points and everything is in order. I then found an old signal relay from a 72 Suz T500 which seemed to be exactly the same relay as the GT550. I wired this up and got the following results:
Ignition switch on and engine run switch in either the ON and/or OFF position, both RH turn signals flash on/off and as well as the indicator light, however when you switch to the LH side, again only the front LH signal comes on as well as the indicator light - there is no flashing.
Could the signal relay be causing this problem? Maybe both the GT550 and old T500 replays are faulty. Any ideas on how to fix this problem would greatly be appreciated.