you?ll find it for free at cygnusx1

Relay worked!!!! (so far......)
 

I put in a relay yesterday and tightened the + on the starter and it STARTS! it sounds much stronger than before, so far so good. Thanks CYi6f and BillUK.

I have an 88 Supra all stock 5-spd and recently had it in the shop for an alternator and master cylinder. Everything was working fine accept it would randomly quit starting for no reason. (usually a sign of electrical trouble), i would turn the key and all i would hear is a click under the dashboard behind the glove box and a click from the starter. i had the starter tested and it checked out OK. I had the battery tested and it checked out ok.

i googled this forum and found this thread. i put in a 4 prong 30amp relay with 14gauge wire then tightened down the + on the starter. Original wiring was brittle and loose.(in fact i have to check all my grounds and +)

SUPRA pros- 5 spd/fast/fun
SUPRA cons- head gaskets/alarm/weight/wiring on the starter

i know this is gonna sound stupid but i have the same exact problem. only thing is how do you wire up that relay? everyone says they do it but i just want to know exacts. is a 14g wire from the positive to the relay and thats it or what? Hopefully someone can answer me. thanx

the way i did it
 

im not sure what everyone else did, As some have stated the wires get old and resistance goes up and conductivity goes down. so i used 14 gauge on all 4 wires, guess you can use any gauge wire that will handle the current. for example 14 gauge can handle 32amps. (Wire-Gauge Ampacity - Transwiki)

i guess what the 'relay solution' does is it uses the weak blue wire to flip the relay switch(instead of the starter solenoid) that in turn allows a direct draw from the battery through the relay with brand new wire. also make sure your positive on the starter is not corroded or loose. on the first page of this thread is the diagram. (5th prong not necessary unless you install a kill switch), anyway, hope this helps a little, its been 5 days in cold weather since ive put in the relay and so far no problems.

thanx guys for your reply. im going to try it out this weekand

Fixed starting problem, thanks
 

Thanks to Cyfi6 and Bill UK I was able to start my 1988 supra 7m-gte, I replaced the strarter which I tested and it was burned out, had problem with top bolt but was able to reach it with a 2 foot extension and universal socket with a 14mm attached and I reached it from the front of the car with my hand under the exhaust manifold and I used the weight of the starter to hold the bolt from moving while I unscrewed the nut. Then I jump started it and it started, but when I cut it off it wouldn't start again, so I came to this forum I purchased the 30 amp relay plus 18 gauge wire and wired it first based off the wiring diagram that Cy Fi6 posted and it didn't start so I wired it based off of Bill UK wiring diagram and it started right up and has continued to start everytime. I'm in chicago so it was very cold when I changed the starter out and put the relay in.

I could not have done it if this forum did not exist so thanks to this forum admin (cre) and a special thanks to Bill UK and CY fi6

I'm having similar issues. I think i'll try it. i'll repost after see if it helped