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Old 05-22-2019   #5
ghlkal
 
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Join Date: Jan 2012
Location: Wisconsin
Posts: 885
Default Re: Classic no start “relay fix” – what does it do?

Thanks Jim, Cliff, and Paul.


So, Paul, the starter solenoid requires more current that can be supplied if the contacts and loads leading up to the solenoid introduce too much resistance. (true?)


I have my clutch switch bypassed, but I still experience an occasional no start.


I plan on doing the relay fix anyway. I'm also going to follow ZR-71's thread where rather than cutting the purple wire in the loom under the hood, he routed from the under the dash disconnecting wires from the clutch switch.



Here's my plan


mount new relay under dash --

pin 30 [high power in] -- new red 12ga wire from battery block
pin 87 [high power out] -- purple wire at clutch switch
pin 85 [low power ground] -- to ground
ping 88 [low power trigger] -- yellow/black wire at clutch switch


pins 30 and 87 are the "high power / battery voltage" legs of the relay
pins 85 and 86 are the "lower current / trigger" legs of the relay


So, the yellow/black wire which comes from the existing starter enable relay will send the signal to trigger the relay and provide battery power through the purple wire to the starter solenoid.
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1990 ZR-1 #2180 Red/Black
Many of the usual mods for 460HP, tuned by Marc Haibeck
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